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POUpdatePanel doesn't do partial-page update, and IsInAsyncPostBack is always false
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  1. POUpdatePanel doesn't do partial-page update, and IsInAsyncPostBack is always false
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    copied!<p>I'm attempting to use an UpdatePanel, but can't get partial-page updates to work.</p> <p>When I look at the ScriptManager's IsInAsyncPostBack property, it's always false.</p> <p>Here's a page that reproduces the issue. It has a ScriptManager, an UpdatePanel, a LinkButton within the update panel, and a Button wired up to the UpdatePanel via the Triggers collection.</p> <pre><code>&lt;%@ Page Language="C#" %&gt; &lt;script runat="server"&gt; protected void Page_Load(object sender, EventArgs e) { Label1.Text = DateTime.Now.ToString(); if (IsPostBack) Label1.Text += " - Postback!"; if (ScriptManager1.IsInAsyncPostBack) Label1.Text += " - Async!"; } &lt;/script&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" /&gt; &lt;asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server"&gt; &lt;ContentTemplate&gt;Panel 1:&lt;asp:Label runat=server ID=Label1 /&gt;&lt;br /&gt; &lt;asp:LinkButton runat=server ID="LinkButton1" Text="Update!"&gt;&lt;/asp:LinkButton&gt;&lt;/ContentTemplate&gt; &lt;Triggers&gt;&lt;asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /&gt;&lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; &lt;asp:Button ID="Button1" Text="Refresh Panel 1" runat="server" UseSubmitBehavior=false /&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>If I run this code and click on either of the buttons, I see "Panel 1:2/8/2010 3:38:41 PM - Postback!"</p> <p>I expected that clicking either button would cause a partial-page update for UpdatePanel1, that IsInAsyncPostBack would be true, and that " - Async!" would be appended to Label1.</p> <p>Any idea why IsInAsyncPostBack is always false?</p>
 

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