IList--->DataTable

using  System.Collections;
using  System.Reflection;
using  System.Data;
using  System;
public   class  CADataConverter
{
    private static Hashtable types = new Hashtable();
    private CADataConverter()
    { }
    public static DataTable ToDataTable(IList list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("List","List can't be null");
        }
        if (list.Count < 1)
        {
            throw new ArgumentOutOfRangeException("List", "List can't be empty");
        }
        object obj = list[0];
        if (obj == null)
        {
            throw new ArgumentOutOfRangeException("List","First imem can't be null");
        }
        //
        return ToDataTable(list, obj.GetType());


    
    }
    public static DataTable ToDataTable(IList list,Type t)
    {
        DataTable dt = (DataTable)types[t];
        if (dt == null)
        {
            CreateShell(t);
        }
        else
        {
            dt = dt.Clone();
        }
        if (list == null || list.Count < 1)
        { return dt; }
        foreach (object item in list)
        {
            if (item == null)
            {
                DataRow dr = dt.NewRow();
                /**//*dr[0]=
                    dr[1]=*/
                foreach (DataColumn col in dt.Columns)
                { 
                    dr[col.ColumnName]=t.GetProperty(col.ColumnName).GetValue(item,null);
                }
                dt.Rows.Add(dr);
            }
        }
        return dt;


    }

    protected static DataTable CreateShell(Type t)
    {
        DataTable dt = new DataTable(t.Name);
        PropertyInfo[] infos = t.GetProperties();
        foreach (PropertyInfo info in infos)
        { 
            if(info.CanRead)
            {
                string str = info.PropertyType.ToString();
                switch (str)
                {
                    case "System.String":
                    case "System.Int32":
                    case "System.Boolean":
                    case "System.Double":
                    case "System.Guid":
                        dt.Columns.Add(info.Name, info.PropertyType);
                        break;
                    
                }
            }
        }
        types[t] = dt;
        return dt;
    }

    
}