how to get server control id

Hi,
   how to get the id of the server control in aspx page like,.


<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"> <Columns> <asp:TemplateField HeaderText="No"> <ItemTemplate> <asp:CheckBox runat="server" ID="CheckBox1" /> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Name"></asp:TemplateField> </Columns> </asp:GridView> <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"> <ContentTemplate> </ContentTemplate> <Triggers> <%--Here I How can i Get the id of checkbox1 from gridview--%> </Trigge ...