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How to solve unknown server tag 'asp:ListView'

Recently I got this error message, basically telling me I was using an unknown server control. In this case, the ListView control. First thing that comes to mind is if the control itself exists in .NET 3.5, which I was using. Of course it does!

Next thing, I was reading about the solution to this being to completely reinstall .NET Framework 3.5 and .NET Framework 3.5 SP1.

However, I solved it by adding two lines to the Web.Config controls element instead, saving me a lot of time.

Here's the code:

<pages>
  <controls>
	  <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
	  <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
  </controls>
</pages>

Comments

1. Miguel on Jan 15th, 2011 05:26 AM

Thanks for your help!
It was very useful!

2. Ryan on Apr 21st, 2011 02:41 PM

This worked for me in Sharepoint 2007. How bizarre that you would have to reference asp web controls like this in the web.config.

Thanks

3. Erik Rahman on Sep 9th, 2011 05:08 AM

Thanks....it's works :)

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