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how to change the .NET version targeted by my mixed-mode assembly

I converted a project from VS2008 to VS2010, and now I'm getting at runtime:

Unhandled Exception: System.IO.FileLoadException: Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

Googling the error, it seems that you can force compatibility with old assemblies with useLegacyV2RuntimeActivationPolicy, but that's not what I want - I want to build the offending project against the 4.0 runtime. Apparently the visual studio project conversion wizard didn't do this?

It's a managed C++ project. How do I change the targeted .NET version?

Solution

  • Okay, figured it out, dumb mistake: I had an old version of the .DLL sitting in the same directory as the .exe. Changed build configuration to copy the current one (v4.0) there. All better.