This class will request to a database class to return SqlDataReader to Bind DataGrid Control.

using System;
using System.Data.SqlClient;
using System.Web;

Class BindGrid : System.Web.UI.Page
{

private Returneader returnReader;
private DataGrid dataGrid;
public BindGrid()
{

returnReader = new ReturnReader();
BindDataGrid();

}
Private void BindDataGrid()
{

dataGrid.DataSource = returnReader.CreateReader();
dataGrid.DataBind();

}

}

Class ReturnReader
{

private SqlDataReader sqlDataReader = null;
public SqlDataReader CreateReader()
{

SqlConnection con = new SqlConnection("SERVER=.;UID=Ashish;PWD=Ashish;DATABASE =NorthWind");
SqlCommand objCommand = new SqlCommand("SELECT FirstName, LAstName from Employees", con);
sqlDataReader = objCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
return sqlDataReader;

}

}

From：
http://www.c-sharpcorner.com/UploadFile/Ashish1/ReaderClass10292005111908AM/ReaderClass.aspx?ArticleID=ca2c1ef3-9d56-431e-a5b1-75f0885bfc24