Mixed mode assembly is built against version X and cannot be loaded in version Y of the runtime without additional configuration information

Question

After doing some code refactoring, my VS2010 VB.Net Web Application project has stopped compiling with the following error:

\"Mixed mode assembly is built against ve

Answer 1

I got the project to compile by changing 'Generate Serialization Assemblies' from 'Auto' to 'Off' in my app's configuration. The advice all over the internet about useLegacyV2RuntimeActivationPolicy seemed to be a red herring for my situation.