VS2010 pdb lock error when modifying a css file

In one of my VS projects I get this error when I modify a css file in a App_Themes catalog in runtime.

CS0042: Unexpected error creating debug information file '[..]\Temporary ASP.NET Files[..]\App_Theme_MySite.pdb: The process cannot access the file because it is being used by another process.

I've used the Process Explorer and c开发者_如何学Gooncluded that the file is being locked by the devenv.exe file.

In order to proceed I have to restart the entire project. It only happens in this one project and I have been unable to find what differs from other projects where I don't have this problem.

Solution running, css modification, solution crashes.

Any ideas?

I'd similar issue.

Just remove the attribute or change it false.

<!--web.config --><configuration><system.web><compilation optimizeCompilations="false"

Found solution too....after 6-8 hours...