Accessing the .Net 4.0 Com from .Net 1.1 Project [duplicate]

Question

I have external .net library compiled with .net framework 4 (it's provider moved recently to .net 4) My code currently runs on .net framework 3.5 How to use that external library in my application ? Moving whole application to .net 4 needs time and testing, so maybe in a future i will do that, but now, what are the possibilities ?

Answer 1

There are no possibilities, the CLR version that comes with .NET 3.5 cannot load 4.0 assemblies. The metadata format was changed. You have to force your app to use the .NET 4.0 CLR version. Do so by recompiling it with VS2010, targeting 4.0, or by using a .config file that contains the <requestedRuntime> element to ask for "v4.0".

Compatibility for .NET 4.0 is excellent btw.