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

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

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?

Solution

Not 100% sure why this worked, but in the appropriate Temporary ASP.Net Files directory (located at: C:\Windows\Microsoft.NET\Framework64\v4.0.21006\Temporary ASP.NET Files[projectName]) I manually coppied the AjaxControlToolkit.dll.

I was then presented with additional DLLs that were missing, but upon manually copying them to this location also I was able to resolve these issues. Doesn't seem like the best answer, but it ended up working for me.