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August 30, 2007

ASP.NET: System.InvalidOperationException: Mutex could not be created.

Apparently, there is a conflict over a temp folder between Visual Studio 2005 and the web application pool in ASP.NET 2.0. Here is the reported solution:

  1. Make sure Visual Studio 2005 is closed.
  2. Go to the ASP.NET temp folder for the 2.0 Framework and delete your application’s folder(s). The ASP.NET temp folder is located in a directory such as: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files, although it may be different for your computer.
  3. Restart IIS (not sure if that’s absolutely necessary)
  4. Browse to your application’s page before opening Visual Studio 2005.
  5. Now you can open VS2005 and work w/out the problem re-occuring.

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