Gridview+Delete the Row checked

Hi friends Help me to sort out the error!! its not working.. //frontend code <form id="form1" runat="server"> <div> &nbsp;</div> <asp:GridView ID="GridView" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" Width="505px"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:CheckBox ID="CheckBox1" runat="server" /> </ItemTemplate> </asp:TemplateField> <asp:CommandField ShowEditButton="True" /> <asp:CommandField ShowDeleteButton="True" /> </Columns> <FooterStyle BackColor="#5D7B9D" Font-Bold=" ...