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Editorial Team
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Asked: 2026-05-15T07:20:29+00:00

I just installed the release version of Visual Studio 2010, and it looks like

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I just installed the release version of Visual Studio 2010, and it looks like there’s something wrong with the standard ASP.NET server controls.

When I create a basic server control, such as a TextBox, the editor underlines it in green and says (I also get no intellisense for ASP.NET controls):

Element ‘TextBox’ is not a known element. This can occur if there is a compilation
error in the Web site, or the Web.config file is missing.

The web site builds fine, and the Web.config file is not missing:

<?xml version="1.0"?>
<configuration>
<system.web>
  <compilation debug="false" targetFramework="4.0" />
</system.web>
</configuration>

The controls work just fine in the code-behind, and they function correctly when I run the site.

Is there some configuration problem here?

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1 Answer

  1. Editorial Team

    This person who’s a tester on the Visual Web Developer Team offered this workaround, which apparently worked:

    Close VS, delete schema cache, and re-open VS. You can find the schemas under something like:

    C:\Users\Pavel\AppData\Roaming\Microsoft\VisualStudio\10.0\ReflectedSchemas

    It is safe to delete all files in this folder.

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