gridview edit in asp.net c#

<asp:TemplateField HeaderText="DETAIL/UPDATE" ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left"><ItemTemplate><asp:LinkButton ID="LinkButton2" runat="server" ForeColor="Black" OnClick="LinkButton2_Click">SHOW</asp:LinkButton></ItemTemplate>


protected void LinkButton2_Click(object sender, EventArgs e)
    {
                    LinkButton lbtn = sender as LinkButton;
            GridViewRow gvrow = (GridViewRow)lbtn.NamingContainer;
            string ss = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
}</asp:TemplateField>