Could not load file or assembly 'AjaxControlTo

Question

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 1

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.

Answer 2

I got this error message (although another dll file) when I reinstalled my ASP.NET application on a new Windows Server 2008 machine. I searched for a solution to this for hours, trying absolutely everything, but to no avail. Until I deactivated McAfee antivirus. When I did, everything worked like a charm.

Answer 3

I was facing the same issue. After a lot of research I found out that I was using impersonation in the config file. I had to change the impersonation ID to a different user that was local to the server and it resolved the issue immediately.

Answer 4

You can try this: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\ . Just clean up all the folders and files from inside this folder and compile ur application. Happy coding!

Answer 5

Inspect the DLL's properties. If it states somewhere that "this file came from another computer", click the checkbox and "apply", to lift restrictions Windows has put in place.

Answer 6

Remember to also open "Visual Studio" with "Run as administrator" using context-menu [right-click].