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POUserControl does not have public property named ContentTemplate
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  1. POUserControl does not have public property named ContentTemplate
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    copied!<p>This question has been asked a few dozen times before; but has never been solved.</p> <p>i have an <strong><code>UpdatePanel</code></strong></p> <pre><code>&lt;asp:UpdatePanel ID="UpdatePanelSetupToolbar" runat="server"&gt; &lt;ContentTemplate&gt; ... &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>But the <em>visual page designer</em> in Visual Studio (2010 (Professional (Windows (7 (Professional (64-bit)))))) gives the error:</p> <blockquote> <p><strong>Error Creating Control</strong> - UpdatePanelSetupToolbar</p> <p>Type 'System.Web.UI.UserControl' does not have a public property named 'ContentTemplate'.</p> </blockquote> <p><img src="https://i.stack.imgur.com/JAFPt.png" alt="enter image description here"><br> <sup><sup><em>Edit: pretty colors in pretty screenshots are added for pretty effect</em></sup></sup></p> <p>Now, strictly speaking, that is true: <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.usercontrol_properties" rel="nofollow noreferrer"><code>UserControl</code></a> does <strong>not</strong> have a public property called <code>ContentTemplate</code>.</p> <p>Fortunately my <code>UpdatePanel</code> is an <strong><code>UpdatePanel</code></strong>, and it <strong>does</strong> have a public property named <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel.contenttemplate.aspx" rel="nofollow noreferrer"><code>'ContentTemplate'</code></a>.</p> <p>So how do i convince Visual Studio that my <code>UpdatePanel</code> is an <code>UpdatePanel</code>?</p> <h2>Important additional notes</h2> <p>The code above doesn't actually fail as is:</p> <pre><code>&lt;asp:UpdatePanel ID="UpdatePanelSetupToolbar" runat="server"&gt; &lt;ContentTemplate&gt; ... &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>It only fails when i have content inside the <code>...</code> ContentTemplate:</p> <pre><code> &lt;asp:UpdatePanel ID="UpdatePanelSetupToolbar" runat="server"&gt; &lt;ContentTemplate&gt; &lt;Vista:Toolbar ID="ToolbarSetup" runat="server"&gt; &lt;ContentTemplate&gt; &lt;asp:LinkButton ID="bbSetupDays" ToolTip="Specify how many allocations will be available on these selected days" OnClick="bbSetupDays_Click" runat="server"&gt;Setup Selected Days&lt;/asp:LinkButton&gt; &lt;/ContentTemplate&gt; &lt;/Vista:Toolbar&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <ul> <li>but Visual Studio is not complaining about inner <code>ToolbarSetup</code></li> <li>it's complaining about the outer <code>UpdatePanelSetupToolbar</code> control</li> </ul> <p>So what's the deal with </p> <blockquote> <p>Type '%s' does not have a public property named '%s'.</p> </blockquote> <p>?</p> <h2>Unimportant additional notes</h2> <p>The ASP.net web-site compiles, builds, and runs <em>fine</em>. It's just the Visual Studio (2010) designer that complains.</p> <p>So what's the deal with <code>Type '%s' does not have a public property named '%s'.</code>?</p> <h2>Series</h2> <p>This question is one in the ongoing Stackoverflow series, <strong>"Templating user controls"</strong>:</p> <ul> <li><a href="https://stackoverflow.com/questions/11658053/how-to-add-a-templating-to-a-usercontrol/11700540">How to add a Templating to a UserControl?</a></li> <li><a href="https://stackoverflow.com/questions/12323303/how-to-inherit-from-control-rather-than-usercontrol">How to inherit from Control, rather than UserControl?</a></li> <li><a href="https://stackoverflow.com/questions/12321621/usercontrol-has-ispostback-but-control-does-not/12321692">UserControl has IsPostBack, but Control does not</a></li> <li><a href="https://stackoverflow.com/questions/11656637/usercontrol-does-not-have-public-property-named-contenttemplate">UserControl does not have public property named ContentTemplate</a></li> <li><a href="https://stackoverflow.com/questions/12325192/how-do-i-specify-codefilebaseclass-from-web-config">How do i specify CodeFileBaseClass from web.config?</a></li> </ul>
 

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