Auto number column in GridView or DataList ASP.NET

You can do it by adding the flowing line of code on GridView ItemTemplate HTML

<%# Container.DataItemIndex + 1 %>

Example:

<asp:GridView ID="GridView1" AutoGenerateColumns="true" runat="server">

    <Columns>

        <asp:TemplateField HeaderText="Sequence">

            <ItemTemplate>

                <%# Container.DataItemIndex + 1 %>

            </ItemTemplate>

        </asp:TemplateField>

    </Columns>

</asp:GridView>