Downgrade an application from .net 4.0 to 3.5

Question

I have been developing an application in VS2010 and compiling it for the .NET 4.0 as the target framework. After integrating a library into my application, I get the followi

Answer 1

You should be able to make this work by configuration settings in app.Config.

Just add the useLegacyV2RuntimeActivationPolicy="true" flag to your appConfig in the startup section. This causes the .NET 4 runtime to handle older mixed-mode assemblies.