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POHow do I include thead in a runat="server" table element?
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  1. POHow do I include thead in a runat="server" table element?
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    copied!<p>I'm upgrading a big web site project from Visual Studio 2010 to 2012. Throughout my project, I have <code>table</code> elements with the <code>runat="server"</code> attribute. Many of these have <code>thead</code> elements inside of them. When I open it in 2012 and and try to build, I get the following error:</p> <pre><code>Value of type 'System.Web.UI.HtmlControls.HtmlGenericControl' cannot be converted to 'System.Web.UI.HtmlControls.HtmlTableRow' </code></pre> <p>Removing the <code>runat="server"</code> attribute or commenting out <code>thead</code> fixes it. Commenting out only the <code>tr</code> element inside of <code>thead</code> does not fix it. Here is a simplified example that reproduces the problem:</p> <pre><code>&lt;%@ Page Language="VB" AutoEventWireup="false" CodeFile="Test.aspx.vb" Inherits="Test" %&gt; &lt;!DOCTYPE html&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;table id="Example" runat="server"&gt; &lt;thead&gt; &lt;tr&gt; &lt;th&gt;test&lt;/th&gt; &lt;/tr&gt; &lt;/thead&gt; &lt;/table&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The error occurs where the <code>table</code> element opens.</p> <p>How can I fix this without doing one of the following?</p> <ul> <li>Removing the <code>runat="server"</code> attribute </li> <li>Removing the <code>thead</code> element</li> <li>Changing it to an <code>asp:table</code> element</li> </ul> <p>Bonus up vote for someone who explains what 2012 is doing differently that is causing this.</p> <p><strong>UPDATE:</strong></p> <p>The problem does not occur in a web <em>app</em>, only in a web site.</p> <p>The project isn't actually be upgraded, just my development environment. In both cases, I'm using the 4.0 framework</p> <p>I tried using the 4.5 framework, but it didn't help.</p> <p>Sept 10th, 2012: I have an open case with Microsoft support. Their dev team is looking into it.</p> <p>Oct. 24, 2012: Since .NET 4.5 replaces 4.0, I can no longer compile in VS 2010 also. The problem I am experiencing is purely .NET - not Visual Studio. </p>
 

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