using grid view inside update panel with trigger?

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C#

C#4.0

ASP.NET4

I arranged the Grid view with edit,update,cancel and delete buttons..
My question is set the edit button with update panel triggers..how can i try this?

<asp:UpdatePanel ID="up_pnl" runat="server">
        <ContentTemplate>

<pre lang="xml"><asp:GridView ID="GVTraderdueReport" runat="server" EmptyDataText="No Records Found"
                       Style="margin-bottom: 6px" BorderColor="#BDBDBD" AllowPaging="true" PageSize="20"
                       OnPageIndexChanging="GVTraderdueReport_PageIndexChanging" CssClass="center" AutoGenerateColumns="false"
                       DataKeyNames="tradername" OnRowUpdating="GVTraderdueReport_RowUpdating" OnRowCancelingEdit="GVTraderdueReport_RowCancelingEdit"
                       OnRowEditing="GVTraderdueReport_RowEditing" OnRowCommand="GVTraderdueReport_RowCommand"
                        HeaderStyle-BackColor="#b0c4de">
                       <Columns>
                           <asp:TemplateField HeaderText="S.No." FooterStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
                               <ItemTemplate>
                                   <%# Container.DataItemIndex + 1 %>
                               </ItemTemplate>
                           </asp:TemplateField>
                           <asp:BoundField HeaderText="TraderName" DataField="tradername" ItemStyle-HorizontalAlign="Center"
                               ReadOnly="true" />
                           <asp:BoundField HeaderText="Due Amount" DataField="totaldue" ItemStyle-HorizontalAlign="Center"
                               ReadOnly="true" />
                           <asp:TemplateField HeaderText="Received Amount">
                               <EditItemTemplate>
                                   <asp:TextBox runat="server" ID="txt_recamt" Width="90px"></asp:TextBox>
                                   <asp:RequiredFieldValidator ID="RFVrecamt" runat="server" ControlToValidate="txt_recamt"
                                       Display="None" ErrorMessage="Must Enter Received Amount" ValidationGroup="duereport"></asp:RequiredFieldValidator>
                                   <asp:ValidatorCalloutExtender ID="VCErecamt" runat="Server" TargetControlID="RFVrecamt" />
                               </EditItemTemplate>
                           </asp:TemplateField>

</Columns>
                       <EmptyDataTemplate>
                           No Records Found
                       </EmptyDataTemplate>
                   </asp:GridView>
 </ContentTemplate>

<Triggers>
       <asp:AsyncPostBackTrigger ControlID="" />
   </Triggers>
   </Updatepanel>

Here ,which Control id i enter..please help me