Could not load file or assembly 'AjaxControlToolkit' after upgrade to .net 4.0

asp.net ajaxcontroltoolkit .net-4.0-beta-2
ChrisHDog picture ChrisHDog · Dec 15, 2009 · Viewed 56.1k times · Source

I have a web application that I am attempting to upgrade to .net 4.0.

I took the application and opened it via Visual Studio 2010 Beta 2 and selected the upgrade path for that application. The application uses the AjaxControlToolkit. Now that the upgrade is complete when I attempt to access a page I get the error message: "Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. Access is denied."

I've tried:

  • Restarting my machine
  • Clean Solution
  • Removing all files in Temporary ASP.Net Files
  • Relaxing permsissions (added Everyone with Full Control) on the Bin directory, the Temporary ASP.Net Files directory
  • Removing and readding the reference to the AjaxControlToolkit DLL

The related web.config entries for the AjackControlToolkit are:

<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
  <controls>
    <add tagPrefix="ajaxToolkit" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
  </controls>
</pages>

Any ideas as to what is occuring here/how I can fix this issue?

Answer

Jeremy picture Jeremy · Jun 30, 2010

I had a similar problem but was able to resolve by granting full rights to the "Temporary ASP.NET Files" folder for my impersonation identity.

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