Serial number column in a Gridview at runtime

It will give you serial number Automatic increment at Run time

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" >
<Columns>
<asp:TemplateField HeaderText="S.No">
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>