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Editorial Team
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Asked: 2026-05-21T11:04:06+00:00

I have a legacy ASP.NET site I’d like to improve a bit. One area

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I have a “legacy” ASP.NET site I’d like to improve a bit. One area I’d like to do something about is page updates – for now, it’s always full page updates, but I’d like to start using partial updates.

I was hoping to be able to use the ASP.NET UpdatePanel for this – but I’m a bit stuck on how to get this to work for me.

I have a master page which defines several content placeholders – simplified it looks like this:

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Default.master.cs" Inherits="WebForms_Default" %>
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title>MyTitle</title>
</head>
<body>
   <form id="myForm" runat="server">
      <asp:ScriptManager ID="smgrMaster" runat="server" LoadScriptsBeforeUI="true">
         <Scripts>
            <asp:ScriptReference Path="~/Scripts/jquery-1.4.2.min.js" />
         </Scripts>
      </asp:ScriptManager>
      <asp:ContentPlaceHolder runat="server" ID="cphSearch" />
      <asp:ContentPlaceHolder runat="server" ID="cphContent" />
   </form>
</body>
</html>

On my content page, my grid is showing the data inside the cphContent area – and in my cphSearch area I have a number of input controls – a RadioButtonList and two DropDowns. Whenever something in those controls changes, for now, a postback is issued (they have AutoPostback="true" set).

My problem is: how do I tell my UpdatePanel (which I’m trying to wrap around my grid in the cphContent area) to “listen” for postbacks from those three controls from cphSearch ?

<asp:UpdatePanel>
   <ContentTemplate>
      <asp:GridView>
         // grid view defined here
      </asp:GridView>
   </ContentTemplate>
   <Triggers>
      <asp:AsyncPostBackTrigger ControlID=".. what values to put here?? .." />
      <asp:PostBackTrigger ControlID=".. - what values to put here?? .." />
   </Triggers>

When I add my <asp:UpdatePanel>, I get a section <Triggers>, but those controls in the cphSearch content area aren’t visible, so I guess I can’t really add them as update triggers, correct?

Either I’m totally not getting it (absolutely possible!), or I’m missing an obvious step / trick to get this to work – or it’s just not possible. Let me know!

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1 Answer

  1. Editorial Team

    i think its not necessary to put Triggers all the time when you are not able to find control for Triggers some event just use updatepanel without triggers

    <asp:Content ID="Content1" ContentPlaceHolderID="cphSearch" runat="Server">
  <asp:UpdatePanel ID="updateSearch" runat="server">
    <ContentTemplate>
       your searching controls
    </ContentTemplate>
  </asp:UpdatePanel>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="cphContent" runat="Server">
  <asp:UpdatePanel ID="updateContent" runat="server">
    <ContentTemplate>
        your grid
    </ContentTemplate>
  </asp:UpdatePanel>
</asp:Content>

    this will update whole grids, search controls and it will also handles AutoPostBack event but dnt forget to put Update <asp:UpdateProgress> control to see work is in process…

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