I am unable to hit a breakpoint on the server side of a Silverlight web application. I know the code executes as I can break on the asynchronous callback with what I was expecting. It's only my machine with this issue.

I am aware this seems to be a common question, however all the answers to the ones I have seen have not helped me, including:

  • The breakpoint is red indicating it will be hit.
  • Silverlight checkbox is checked on the web project's properties.
  • Clean & build the solution.
  • Getting a new version from source control.
  • Cleared everything from my web browser: cache, cookies etc... (I am using IE).
  • Clearing the temp files in %windir%/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files.
  • Checked that all projects are being built in the configuration manager.
  • Everything set to debug and not release in the configuration manager.
  • Manually attaching to the w3wp.exe process.
  • IIS reset.
  • IIS is set to use .NET v4 and the pipeline set to classic not integrated.
  • Reinstalled IIS and freshly configured.
  • Reinstalled Visual Studio.
  • Reinstalled Silverlight.

I am using Visual Studio 2010 (.NET 4), Silverlight 4, and using IIS (I think 6, cannot remember) to host the site.

Interesting behaviour I have discovered (may help to diagnose):

  • It will still not break if I use Visual Studio's own development server to host the site instead of IIS.
  • I saw a blog post (cannot remember where or I would provide a link) under Debug -> Windows -> Proccess (Ctrl D, P) to check that the w3wp.exe process is set to "Silverlight" under the "Debugging" header - mine was set to "Managed" and was unable to set it to silverlight when attaching. After checking a colleagues settings on a machine which was working, his was also set to managed.
c# silverlight breakpoints
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