(转)SqlCeHelper 类源码 实现了对微软SqlCe数据库(*.sdf)的常用操作

using System;
using System.Data;
using System.Data.SqlServerCe;
using System.Configuration;
using System.Collections;
 
namespace SbuxMobile.DAL
{
    /// 
    /// The SqlCeHelper class is intended to encapsulate high performance, scalable best practices for 
    /// common uses of SqlClient
    /// 
    public sealed partial class SqlCeHelper
    {
        #region private utility methods & constructors
 
        // Since this class provides only static methods, make the default constructor private to prevent 
        // instances from being created with "new SqlCeHelper()"
        private SqlCeHelper() { }
 
        /// 
        /// This method is used to attach array of SqlCeParameters to a SqlCeCommand.
        /// 
        /// This method will assign a value of DbNull to any parameter with a direction of
        /// InputOutput and a value of null.  
        /// 
        /// This behavior will prevent default values from being used, but
        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
        /// where the user provided no input value.
        /// 
        /// The command to which the parameters will be added
        /// An array of SqlCeParameters to be added to command
        private static void AttachParameters(SqlCeCommand command, SqlCeParameter[] commandParameters)
        {
 
            if (command == null) throw new ArgumentNullException("command");
            if (commandParameters != null)
            {
                foreach (SqlCeParameter p in commandParameters)
                {
                    if (p != null)
                    {
                        // Check for derived output value with no value assigned
                        if ((p.Direction == ParameterDirection.InputOutput ||
                            p.Direction == ParameterDirection.Input) &&
                            (p.Value == null))
                        {
                            p.Value = DBNull.Value;
                        }
                        command.Parameters.Add(p);
                    }
                }
            }
        }
 
        /// 
        /// This method assigns dataRow column values to an array of SqlCeParameters
        /// 
        /// Array of SqlCeParameters to be assigned values
        /// The dataRow used to hold the stored procedure's parameter values
        private static void AssignParameterValues(SqlCeParameter[] commandParameters, DataRow dataRow)
        {
            if ((commandParameters == null) || (dataRow == null))
            {
                // Do nothing if we get no data
                return;
            }
 
            int i = 0;
            // Set the parameters values
            foreach (SqlCeParameter commandParameter in commandParameters)
            {
                // Check the parameter name
                if (commandParameter.ParameterName == null ||
                    commandParameter.ParameterName.Length <= 1)
                    throw new Exception(
                        string.Format(
                        "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
                        i, commandParameter.ParameterName));
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                i  ;
            }
        }
 
        /// 
        /// This method assigns an array of values to an array of SqlCeParameters
        /// 
        /// Array of SqlCeParameters to be assigned values
        /// Array of objects holding the values to be assigned
        private static void AssignParameterValues(SqlCeParameter[] commandParameters, object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
            {
                // Do nothing if we get no data
                return;
            }
 
            // We must have the same number of values as we pave parameters to put them in
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("Parameter count does not match Parameter Value count.");
            }
 
            // Iterate through the SqlCeParameters, assigning the values from the corresponding position in the 
            // value array
            for (int i = 0, j = commandParameters.Length; i < j; i  )
            {
                // If the current array value derives from IDbDataParameter, then assign its Value property
                if (parameterValues[i] is IDbDataParameter)
                {
                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                    if (paramInstance.Value == null)
                    {
                        commandParameters[i].Value = DBNull.Value;
                    }
                    else
                    {
                        commandParameters[i].Value = paramInstance.Value;
                    }
                }
                else if (parameterValues[i] == null)
                {
                    commandParameters[i].Value = DBNull.Value;
                }
                else
                {
                    commandParameters[i].Value = parameterValues[i];
                }
            }
        }
 
        /// 
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
        /// to the provided command
        /// 
        /// The SqlCeCommand to be prepared
        /// A valid SqlCeConnection, on which to execute this command
        /// A valid SqlCeTransaction, or 'null'
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlCeParameters to be associated with the command or 'null' if no parameters are required
        /// true if the connection was opened by the method, otherwose is false.
        private static void PrepareCommand(SqlCeCommand command, SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType, string commandText, SqlCeParameter[] commandParameters, out bool mustCloseConnection)
        {
            if (command == null) throw new ArgumentNullException("command");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");
 
            // If the provided connection is not open, we will open it
            if (connection.State != ConnectionState.Open)
            {
                mustCloseConnection = true;
                connection.Open();
            }
            else
            {
                mustCloseConnection = false;
            }
 
            // Associate the connection with the command
            command.Connection = connection;
 
            // Set the command text (stored procedure name or SQL statement)
            command.CommandText = commandText;
 
            // If we were provided a transaction, assign it
            if (transaction != null)
            {
                if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                command.Transaction = transaction;
            }
 
            // Set the command type
            command.CommandType = commandType;
 
            // Attach the command parameters if they are provided
            if (commandParameters != null)
            {
                AttachParameters(command, commandParameters);
            }
            return;
        }
 
        #endregion private utility methods & constructors
 
        #region ExecuteNonQuery
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the database specified in 
        /// the connection string
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
 
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored prcedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteNonQuery(connection, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Finally, execute the command
            int retval = cmd.ExecuteNonQuery();
 
            // Detach the SqlCeParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            if (mustCloseConnection)
                connection.Close();
            return retval;
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteNonQuery(transaction, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns no resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Finally, execute the command
            int retval = cmd.ExecuteNonQuery();
 
            // Detach the SqlCeParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified 
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQuery(SqlCeTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion ExecuteNonQuery
 
        #region ExecuteDatatable
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataTable(connectionString, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
 
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                return ExecuteDataTable(connection, commandType, commandText, commandParameters);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(connString, "GetOrders", 24, 36);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataTable(connection, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Create the DataAdapter & DataTable
            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))
            {
                DataTable dtb = new DataTable();
                dtb.Clear();
                // Fill the DataTable using default values for DataTable names, etc
                da.Fill(dtb);
 
                // Detach the SqlCeParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
 
                if (mustCloseConnection)
                    connection.Close();
 
                // Return the DataTable
                return dtb;
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(conn, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataTable(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataTable(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataTable(transaction, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Create the DataAdapter & DataTable
            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))
            {
                DataTable dtb = new DataTable();
 
                // Fill the DataTable using default values for DataTable names, etc
                da.Fill(dtb);
 
                // Detach the SqlCeParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
 
                // Return the DataTable
                return dtb;
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified 
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataTable dtb = ExecuteDataTable(trans, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A DataTable containing the resultset generated by the command
        public static DataTable ExecuteDataTable(SqlCeTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataTable(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataTable(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion ExecuteDataTable
 
        #region ExecuteDataset
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataset(connectionString, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
 
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                return ExecuteDataset(connection, commandType, commandText, commandParameters);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataset(connection, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Create the DataAdapter & DataSet
            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
 
                // Fill the DataSet using default values for DataTable names, etc
                da.Fill(ds);
 
                // Detach the SqlCeParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
 
                if (mustCloseConnection)
                    connection.Close();
 
                // Return the dataset
                return ds;
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteDataset(transaction, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Create the DataAdapter & DataSet
            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
 
                // Fill the DataSet using default values for DataTable names, etc
                da.Fill(ds);
 
                // Detach the SqlCeParameters from the command object, so they can be used again
                cmd.Parameters.Clear();
 
                // Return the dataset
                return ds;
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified 
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDataset(SqlCeTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion ExecuteDataset
 
        #region ExecuteReader
 
        /// 
        /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlCeHelper, so that
        /// we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// 
        private enum SqlCeConnectionOwnership
        {
            /// Connection is owned and managed by SqlCeHelper
            Internal,
            /// Connection is owned and managed by the caller
            External
        }
 
        /// 
        /// Create and prepare a SqlCeCommand, and call ExecuteReader with the appropriate CommandBehavior.
        /// 
        /// 
        /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
        /// 
        /// If the caller provided the connection, we want to leave it to them to manage.
        /// 
        /// A valid SqlCeConnection, on which to execute this command
        /// A valid SqlCeTransaction, or 'null'
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlCeParameters to be associated with the command or 'null' if no parameters are required
        /// Indicates whether the connection parameter was provided by the caller, or created by SqlCeHelper
        /// SqlCeDataReader containing the results of the command
        private static SqlCeDataReader ExecuteReader(SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType, string commandText, SqlCeParameter[] commandParameters, SqlCeConnectionOwnership connectionOwnership)
        {
            if (connection == null) throw new ArgumentNullException("connection");
 
            bool mustCloseConnection = false;
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            try
            {
                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
                // Create a reader
                SqlCeDataReader dataReader;
 
                // Call ExecuteReader with the appropriate CommandBehavior
                if (connectionOwnership == SqlCeConnectionOwnership.External)
                {
                    dataReader = cmd.ExecuteReader();
                }
                else
                {
                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
 
                // Detach the SqlCeParameters from the command object, so they can be used again.
                // HACK: There is a problem here, the output parameter values are fletched 
                // when the reader is closed, so if the parameters are detached from the command
                // then the SqlReader can磘 set its values. 
                // When this happen, the parameters can磘 be used again in other command.
                bool canClear = true;
                foreach (SqlCeParameter commandParameter in cmd.Parameters)
                {
                    if (commandParameter.Direction != ParameterDirection.Input)
                        canClear = false;
                }
 
                if (canClear)
                {
                    cmd.Parameters.Clear();
                }
 
                return dataReader;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteReader(connectionString, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            SqlCeConnection connection = null;
            try
            {
                connection = new SqlCeConnection(connectionString);
                connection.Open();
 
                // Call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlCeConnectionOwnership.Internal);
            }
            catch
            {
                // If we fail to return the SqlDatReader, we need to close the connection ourselves
                if (connection != null) connection.Close();
                throw;
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                AssignParameterValues(commandParameters, parameterValues);
 
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteReader(connection, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            // Pass through the call to the private overload using a null transaction value and an externally owned connection
            return ExecuteReader(connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, SqlCeConnectionOwnership.External);
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                AssignParameterValues(commandParameters, parameterValues);
 
                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteReader(transaction, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///   SqlCeDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
 
            // Pass through to private overload, indicating that the connection is owned by the caller
            return ExecuteReader((SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, SqlCeConnectionOwnership.External);
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  SqlCeDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReader(SqlCeTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                AssignParameterValues(commandParameters, parameterValues);
 
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion ExecuteReader
 
        #region ExecuteScalar
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteScalar(connectionString, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                return ExecuteScalar(connection, commandType, commandText, commandParameters);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteScalar(connection, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
 
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Execute the command & return the results
            object retval = cmd.ExecuteScalar();
 
            // Detach the SqlCeParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
 
            if (mustCloseConnection)
                connection.Close();
 
            return retval;
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of SqlCeParameters
            return ExecuteScalar(transaction, commandType, commandText, (SqlCeParameter[])null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
 
            // Create a command and prepare it for execution
            SqlCeCommand cmd = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Execute the command & return the results
            object retval = cmd.ExecuteScalar();
 
            // Detach the SqlCeParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// An array of objects to be assigned as the input values of the stored procedure
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalar(SqlCeTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion ExecuteScalar
 
        #region FillDataset
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
 
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                FillDataset(connection, commandType, commandText, dataSet, tableNames);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters used to execute the command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        public static void FillDataset(string connectionString, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        ///     
        /// An array of objects to be assigned as the input values of the stored procedure
        public static void FillDataset(string connectionString, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // Create & open a SqlCeConnection, and dispose of it after we are done
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                connection.Open();
 
                // Call the overload that takes a connection in place of the connection string
                FillDataset(connection, spName, dataSet, tableNames, parameterValues);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection. 
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        ///     
        public static void FillDataset(SqlCeConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames)
        {
            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        /// An array of SqlParamters used to execute the command
        public static void FillDataset(SqlCeConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlCeParameter[] commandParameters)
        {
            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
        /// 
        /// A valid SqlCeConnection
        /// The name of the stored procedure
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        /// An array of objects to be assigned as the input values of the stored procedure
        public static void FillDataset(SqlCeConnection connection, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction. 
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        public static void FillDataset(SqlCeTransaction transaction, CommandType commandType,
            string commandText,
            DataSet dataSet, string[] tableNames)
        {
            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
        }
 
        /// 
        /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        /// An array of SqlParamters used to execute the command
        public static void FillDataset(SqlCeTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlCeParameter[] commandParameters)
        {
            FillDataset((SqlCeConnection)transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified 
        /// SqlCeTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// 
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
        /// 
        /// A valid SqlCeTransaction
        /// The name of the stored procedure
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        /// An array of objects to be assigned as the input values of the stored procedure
        public static void FillDataset(SqlCeTransaction transaction, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);
 
                // Call the overload that takes an array of SqlCeParameters
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // Otherwise we can just call the SP without params
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }
 
        /// 
        /// Private helper method that execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction and SqlCeConnection
        /// using the provided parameters.
        /// 
        /// 
        /// e.g.:  
        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));
        /// 
        /// A valid SqlCeConnection
        /// A valid SqlCeTransaction
        /// The CommandType (stored procedure, text, etc.)
        /// The stored procedure name or T-SQL command
        /// A dataset wich will contain the resultset generated by the command
        /// This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// 
        /// An array of SqlParamters used to execute the command
        private static void FillDataset(SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlCeParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
 
            // Create a command and prepare it for execution
            SqlCeCommand command = new SqlCeCommand();
            bool mustCloseConnection = false;
            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
 
            // Create the DataAdapter & DataSet
            using (SqlCeDataAdapter dataAdapter = new SqlCeDataAdapter(command))
            {
 
                // Add the table mappings specified by the user
                if (tableNames != null && tableNames.Length > 0)
                {
                    string tableName = "Table";
                    for (int index = 0; index < tableNames.Length; index  )
                    {
                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                        tableName  = (index   1).ToString();
                    }
                }
 
                // Fill the DataSet using default values for DataTable names, etc
                dataAdapter.Fill(dataSet);
 
                // Detach the SqlCeParameters from the command object, so they can be used again
                command.Parameters.Clear();
            }
 
            if (mustCloseConnection)
                connection.Close();
        }
        #endregion
 
        #region UpdateDataset
        /// 
        /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
        /// 
        /// 
        /// e.g.:  
        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
        /// 
        /// A valid transact-SQL statement or stored procedure to insert new records into the data source
        /// A valid transact-SQL statement or stored procedure to delete records from the data source
        /// A valid transact-SQL statement or stored procedure used to update records in the data source
        /// The DataSet used to update the data source
        /// The DataTable used to update the data source.
        public static void UpdateDataset(SqlCeCommand insertCommand, SqlCeCommand deleteCommand, SqlCeCommand updateCommand, DataSet dataSet, string tableName)
        {
            if (insertCommand == null) throw new ArgumentNullException("insertCommand");
            if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
            if (updateCommand == null) throw new ArgumentNullException("updateCommand");
            if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");
 
            // Create a SqlCeDataAdapter, and dispose of it after we are done
            using (SqlCeDataAdapter dataAdapter = new SqlCeDataAdapter())
            {
                // Set the data adapter commands
                dataAdapter.UpdateCommand = updateCommand;
                dataAdapter.InsertCommand = insertCommand;
                dataAdapter.DeleteCommand = deleteCommand;
 
                // Update the dataset changes in the data source
                dataAdapter.Update(dataSet, tableName);
 
                // Commit all the changes made to the DataSet
                dataSet.AcceptChanges();
            }
        }
        #endregion
 
        #region CreateCommand
        /// 
        /// Simplify the creation of a Sql command object by allowing
        /// a stored procedure and optional parameters to be provided
        /// 
        /// 
        /// e.g.:  
        ///  SqlCeCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// An array of string to be assigned as the source columns of the stored procedure parameters
        /// A valid SqlCeCommand object
        public static SqlCeCommand CreateCommand(SqlCeConnection connection, string spName, params string[] sourceColumns)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // Create a SqlCeCommand
            SqlCeCommand cmd = new SqlCeCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;
 
            // If we receive parameter values, we need to figure out where they go
            if ((sourceColumns != null) && (sourceColumns.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Assign the provided source columns to these parameters based on parameter order
                for (int index = 0; index < sourceColumns.Length; index  )
                    commandParameters[index].SourceColumn = sourceColumns[index];
 
                // Attach the discovered parameters to the SqlCeCommand object
                AttachParameters(cmd, commandParameters);
            }
 
            return cmd;
        }
        #endregion
 
        #region ExecuteNonQueryTypedParams
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection 
        /// using the dataRow column values as the stored procedure's parameters values.  
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQueryTypedParams(SqlCeConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified
        /// SqlCeTransaction using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid SqlCeTransaction object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An int representing the number of rows affected by the command
        public static int ExecuteNonQueryTypedParams(SqlCeTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // Sf the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion
 
        #region ExecuteDatasetTypedParams
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            //If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the dataRow column values as the store procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDatasetTypedParams(SqlCeConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// 
        /// A valid SqlCeTransaction object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A dataset containing the resultset generated by the command
        public static DataSet ExecuteDatasetTypedParams(SqlCeTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }
 
        #endregion
 
        #region ExecuteReaderTypedParams
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReaderTypedParams(SqlCeConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid SqlCeTransaction object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// A SqlCeDataReader containing the resultset generated by the command
        public static SqlCeDataReader ExecuteReaderTypedParams(SqlCeTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion
 
        #region ExecuteScalarTypedParams
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection 
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalarTypedParams(SqlCeConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }
 
        /// 
        /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeTransaction
        /// using the dataRow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// 
        /// A valid SqlCeTransaction object
        /// The name of the stored procedure
        /// The dataRow used to hold the stored procedure's parameter values.
        /// An object containing the value in the 1x1 resultset generated by the command
        public static object ExecuteScalarTypedParams(SqlCeTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);
 
                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);
 
                return SqlCeHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlCeHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion
 
    }
 
    /// 
    /// SqlCeHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
    /// ability to discover parameters for stored procedures at run-time.
    /// 
    public sealed class SqlCeHelperParameterCache
    {
        #region private methods, variables, and constructors
 
        //Since this class provides only static methods, make the default constructor private to prevent 
        //instances from being created with "new SqlCeHelperParameterCache()"
        private SqlCeHelperParameterCache() { }
 
        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());
 
        /// 
        /// Resolve at run time the appropriate set of SqlCeParameters for a stored procedure
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// Whether or not to include their return value parameter
        /// The parameter array discovered.
        private static SqlCeParameter[] DiscoverSpParameterSet(SqlCeConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            SqlCeCommand cmd = new SqlCeCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;
 
            connection.Open();
 
            //SqlCeCommandBuilder.DeriveParameters(cmd);
            connection.Close();
 
            if (!includeReturnValueParameter)
            {
                cmd.Parameters.RemoveAt(0);
            }
 
            SqlCeParameter[] discoveredParameters = new SqlCeParameter[cmd.Parameters.Count];
 
            cmd.Parameters.CopyTo(discoveredParameters, 0);
 
            // Init the parameters with a DBNull value
            foreach (SqlCeParameter discoveredParameter in discoveredParameters)
            {
                discoveredParameter.Value = DBNull.Value;
            }
            return discoveredParameters;
        }
 
        /// 
        /// Deep copy of cached SqlCeParameter array
        /// 
        /// 
        /// 
        private static SqlCeParameter[] CloneParameters(SqlCeParameter[] originalParameters)
        {
            SqlCeParameter[] clonedParameters = new SqlCeParameter[originalParameters.Length];
 
            for (int i = 0, j = originalParameters.Length; i < j; i  )
            {
                clonedParameters[i] = (SqlCeParameter)((ICloneable)originalParameters[i]).Clone();
            }
 
            return clonedParameters;
        }
 
        #endregion private methods, variables, and constructors
 
        #region caching functions
 
        /// 
        /// Add parameter array to the cache
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters to be cached
        public static void CacheParameterSet(string connectionString, string commandText, params SqlCeParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");
 
            string hashKey = connectionString   ":"   commandText;
 
            paramCache[hashKey] = commandParameters;
        }
 
        /// 
        /// Retrieve a parameter array from the cache
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The stored procedure name or T-SQL command
        /// An array of SqlParamters
        public static SqlCeParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");
 
            string hashKey = connectionString   ":"   commandText;
 
            SqlCeParameter[] cachedParameters = paramCache[hashKey] as SqlCeParameter[];
            if (cachedParameters == null)
            {
                return null;
            }
            else
            {
                return CloneParameters(cachedParameters);
            }
        }
 
        #endregion caching functions
 
        #region Parameter Discovery Functions
 
        /// 
        /// Retrieves the set of SqlCeParameters appropriate for the stored procedure
        /// 
        /// 
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// An array of SqlCeParameters
        public static SqlCeParameter[] GetSpParameterSet(string connectionString, string spName)
        {
            return GetSpParameterSet(connectionString, spName, false);
        }
 
        /// 
        /// Retrieves the set of SqlCeParameters appropriate for the stored procedure
        /// 
        /// 
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// 
        /// A valid connection string for a SqlCeConnection
        /// The name of the stored procedure
        /// A bool value indicating whether the return value parameter should be included in the results
        /// An array of SqlCeParameters
        public static SqlCeParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            using (SqlCeConnection connection = new SqlCeConnection(connectionString))
            {
                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
            }
        }
 
        /// 
        /// Retrieves the set of SqlCeParameters appropriate for the stored procedure
        /// 
        /// 
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// An array of SqlCeParameters
        internal static SqlCeParameter[] GetSpParameterSet(SqlCeConnection connection, string spName)
        {
            return GetSpParameterSet(connection, spName, false);
        }
 
        /// 
        /// Retrieves the set of SqlCeParameters appropriate for the stored procedure
        /// 
        /// 
        /// This method will query the database for this information, and then store it in a cache for future requests.
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// A bool value indicating whether the return value parameter should be included in the results
        /// An array of SqlCeParameters
        internal static SqlCeParameter[] GetSpParameterSet(SqlCeConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            using (SqlCeConnection clonedConnection = connection)
            {
                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
            }
        }
 
        /// 
        /// Retrieves the set of SqlCeParameters appropriate for the stored procedure
        /// 
        /// A valid SqlCeConnection object
        /// The name of the stored procedure
        /// A bool value indicating whether the return value parameter should be included in the results
        /// An array of SqlCeParameters
        private static SqlCeParameter[] GetSpParameterSetInternal(SqlCeConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
 
            string hashKey = connection.ConnectionString   ":"   spName   (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");
 
            SqlCeParameter[] cachedParameters;
 
            cachedParameters = paramCache[hashKey] as SqlCeParameter[];
            if (cachedParameters == null)
            {
                SqlCeParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                paramCache[hashKey] = spParameters;
                cachedParameters = spParameters;
            }
 
            return CloneParameters(cachedParameters);
        }
 
        #endregion Parameter Discovery Functions
 
    }
}

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