C# Passing Associative Arrays to PL/SQL Code

CREATE OR REPLACE PACKAGE ProductsPackage IS
  TYPE DecimalArray IS TABLE OF DECIMAL INDEX BY BINARY_INTEGER;
  TYPE StringArray IS TABLE OF VARCHAR2(255) INDEX BY BINARY_INTEGER;
  PROCEDURE proc_UpdateMultiplePrices(ProdPrices IN DecimalArray, ProdNames IN 
  StringArray);
END ProductsPackage;

/

CREATE OR REPLACE PACKAGE BODY ProductsPackage IS
  PROCEDURE proc_UpdateMultiplePrices(ProdPrices IN DecimalArray, ProdNames IN 
  StringArray)   
 IS
 BEGIN
    FOR i IN 1..ProdNames.LAST
  LOOP
UPDATE Products SET Price = Price + ProdPrices(i) WHERE Name = 
 ProdNames(i);
  END LOOP;
 END;
END ProductsPackage;

/

private void btnUpdateMultiplePrices_Click(object sender, EventArgs e)
{
  String _connstring = "Data Source=localhost/NEWDB;User 
  Id=EDZEHOO;Password=PASS123;";
 try
 { OracleConnection _connObj = new OracleConnection(_connstring);
  _connObj.Open();
  OracleCommand _cmdObj = _connObj.CreateCommand();
  _cmdObj.CommandText = "ProductsPackage.proc_UpdateMultiplePrices";
  _cmdObj.CommandType = CommandType.StoredProcedure;
  OracleParameter _priceParam = new OracleParameter();
  _priceParam.ParameterName = "ProdPrices";
  _priceParam.OracleDbType = OracleDbType.Decimal;
  _priceParam.Direction = ParameterDirection.Input;
  _priceParam.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
  Decimal [] decArray= new Decimal[3];
  decArray[0] = 100;
  decArray[1] = 300;
  decArray[2] = 500;
  _priceParam.Value = decArray;
  _cmdObj.Parameters.Add(_priceParam);
  OracleParameter _NameParam = new OracleParameter();
  _NameParam.ParameterName = "ProdNames";
  _NameParam.OracleDbType = OracleDbType.Varchar2;
  _NameParam.Direction = ParameterDirection.Input;
  _NameParam.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
  String[] stringArray = new String[3];
  stringArray[0] = "Engine";
  stringArray[1] = "Windshield";
  stringArray[2] = "Rear Lights";
  _NameParam.Value = stringArray;
  _cmdObj.Parameters.Add(_NameParam);
  _cmdObj.ExecuteNonQuery();  MessageBox.Show("All products updated!");
 
                _connObj.Close();
                _connObj.Dispose();
                _connObj = null;
 }
  catch (Exception ex)
 {
  MessageBox.Show(ex.ToString());
 }
}