gridview in asp.net paging

<asp:gridview id="DgTest" runat="server" autogeneratecolumns="False" xmlns:asp="#unknown">
           Width="100%" AllowSorting="True" OnRowCommand="DgTest_RowCommand"
           OnRowDataBound="DgTest_RowDataBound" AllowPaging="True"
           onpageindexchanging="DgTest_PageIndexChanging" CaptionAlign="Right">
            <pagersettings firstpagetext="First" lastpagetext="Last">
               Mode="NextPreviousFirstLast" NextPageText="Next"  PreviousPageText="Previous" />
           <columns>
               <asp:boundfield datafield="ID" headertext="Id" />
               <asp:boundfield datafield="NAME" headertext="Name of Emp" />
           </columns>
       </pagersettings></asp:gridview>

protected void DgTest_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            DgTest.PageIndex = e.NewPageIndex;
            Populate();
        }

private void Populate()
        {
            //Code To get datasource to Databind
        }