Pattern to fill collections for Object-relational mapping in C#.Net

Hi,
Now with generics creating collections is very easy in .Net.
but filling the collections with data has been a repeated coding job always.
This made me write this pattern by which we can create a new collection class in just couple of lines. This uses the same filling method used by ORM (Object-relational mapping ) object.

using System;
using System.Collections.Generic;
using System.Data;

namespace Prashant.Components.DBDataLister
{

    // define a delegate for standard database retrival methods
    public delegate IDataReader DBSelect(SearchParams Criteria);

    // Interface of ORM
    public interface IDBObject
    {
        void FillProperties(IDataReader dr);
    }

   // Interface of ORM collection
    public interface IDBObjectList : System.Collections.IList
    {
        IDBObject NewItem();
    }
  
    // This class standizes the parameters for database retrival methods
    public class SearchParams : Dictionary < string, string > 
    {
    }

    // The Collection filler class
    internal static class DataLister
    {

        // The Fill method: Gets the data from db and fills the collection
        // Paramters: 1) The List to fill
                      2) The method to get the data
                      3) Criteria for the filtering the data
 
        internal static IDBObjectList FillData(IDBObjectList List, 
                                DBSelect DoSelect, SearchParams Criteria)
        {
            IDataReader dr = DoSelect(Criteria);
            while (dr.Read())
            {
                IDBObject objArr = List.NewItem();
                objArr.FillProperties(dr);
                List.Add(objArr);
            }
            return List;
        }
    }

 }
// End 

Now lets see how to use this in the sample below

using System;
using System.Collections.Generic;
using System.Data;
using Prashant.Components.DBDataLister;

namespace TestProj.Components
{
    // A sample ORM class - for the database table Orders
    public class Order : IDBObject  // To enforce the FillProperties method
    {
        public string OrderNumber
        { get; private set; }
        public string OrderDate
        { get; private set; }
        public string Customer
        { get; private set; }

        public void FillProperties(IDataReader dr)
        {
            OrderNumber = (string)dr["OrderNumber"];
            OrderDate = (string)dr["OrderDate"];
            Customer = (string)dr["Customer"];
        }
    }
    // Data service Class/methods for the ORM
     public class OrderService
    {
        public static IDataReader getOrderData(SearchParams Criteria)
        {   // db retivial code goes here ...full code omited
            IDataReader dr = DataService.getOrderList(.....);
            return dr;
        }
    }


   // This is the collection for Orders

    public class OrderList : List < Order >, IDBObjectList
    {
        public IDBObject NewItem()
        {
            return (new Order());
        }

        //  Returns the filled collection
        public static OrderList getList(SearchParams Criteria)
        {
            return ((OrderList)DataLister.FillData(new OrderList(), 
                        new DBSelect(OrderService.getOrderData), Criteria));

        }

    }

    
   }

See the "OrderList" class sample given .
Your gridview cab be bound by

        grv.Datasource = OrderList.getList(Criteria);