The debugger does not support debugging managed and native code at the same time on this platform.

You might receive the "The debugger does not support debugging managed and native code at the same time on this platform." error message in Visual studio 2005/2008 if you have a 32bit native/mixed mode dll linked to your x64bit assembly.  If you change the project properties so that Platform target is x86 you should be able to debug both assemblies.

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