gridview edit in vb

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


 Protected  Sub LinkButton2_Click(ByVal sender As Object, ByVal e As EventArgs)
                    Dim lbtn As LinkButton =  sender as LinkButton

            Dim gvrow As GridViewRow = CType(lbtn.NamingContainer, GridViewRow)

            Dim ss As String =  GridView1.DataKeys(gvrow.RowIndex).Value.ToString()

End Sub<asp:LinkButton ID="LinkButton2" runat="server" ForeColor="Black" <ItemTemplate>
</asp:TemplateField>asp:TemplateField HeaderText="UPDATE" ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left">