C#

using System;
using System.ComponentModel;
using System.Data;
using System.Reflection;

namespace MyApp.DataAccess
{
    public abstract class EntityTable : DataTable
    {
        [DataObjectMethod(DataObjectMethodType.Select, true)]
        public abstract DataTable Fill(object parameter);

        protected DataTable GetDataTable(System.Collections.IList list, Type typ)
        {
            DataTable dt = new DataTable();
            return dt;
        }
    }
}

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

using MyApp.DataAccess;

namespace MyApp.Data.Employee
{
    public class CMyEntityTable : EntityTable // problem is here
    {

        public override DataTable Fill(object parameter)
        {
            return blah blah;
        }
    }
}