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    <p>Only the content of the update panel will be updated. So you need to remove your update panels from panel1 and panel2 and then place panel1 and panel2 in the same update panel.</p> <p>Edit: From your sample if we expanded the default.aspx to include TestUserControl1 we get something like:</p> <pre><code> &lt;asp:Panel ID="panelUC1" runat="server" Visible="false"&gt; &lt;asp:Panel ID="panelUC1" runat="server"&gt; &lt;div&gt; &lt;asp:Label ID="Label1" runat="server" Text="User Control 1...." /&gt; &lt;/div&gt; &lt;asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional"&gt; &lt;ContentTemplate&gt; &lt;!-- only the content in from here --&gt; &lt;div&gt; &lt;asp:Button ID="buttonNext" runat="server" OnClick="buttonNext_Click" Text="Click" /&gt; &lt;/div&gt; &lt;!-- to here will change when you click on buttonNext --&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; &lt;/asp:Panel&gt; &lt;/asp:Panel&gt; &lt;asp:Panel ID="panelUC2" runat="server" Visible="false"&gt; &lt;tuc2:testUserControl2 ID="testUserControl2" runat="server" /&gt; &lt;/asp:Panel&gt; </code></pre> <p>When you click on buttonNext the page will postback and go throught the full asp.net lifecycle, however the javascript that controls the update panel will only apply the changes made to contenttemplate of the update panel that made the request to the dom already present in the browser. Try resetting the text of buttonNext in the click event and see what I'm trying to say. </p> <p>I found this article <a href="http://msdn.microsoft.com/en-us/library/Bb398780(en-us,VS.90).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/Bb398780(en-us,VS.90).aspx</a> on update panels and usercontrols.</p>
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    1. POStrange new error with ASP:Panel / UserControl / UpdatePanel combination
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    1. COThanks Dug, but there is no UpdatePanel in the ASPX page, only in the UserControls - take a look in the code sample.
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      1. USNeal Hudson
    2. COThe update panel allows you to do partial page rendering, and will only display changes to the content of the submitting update panel. So when I removed the update panels from the user controls in your code sample and added an update panel surrounding but user controls to the default.aspx page it displayed the text of the label in the second user control as expected.
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    3. COAs I said in the original post Dug: "If you remove the UpdatePanels out of UserControl1 and UserControl2, the code works." This much I know. The code used to work. I'm looking to find out why it doesn't now, because as far as I can tell there is nothing wrong with the code and should work perfectly as is.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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