Libraries with Unity ?

Good evening,
First of all, I’m sorry of my bad level in English, i hope you understand my question.

I know that this questions was always many times ask but i don’t find a clear answer yet…

I would like to know if it’s possible to add a reference to Unity’s project even if it isn’t in 2.0 framework version ?
When i add my library i’ve this :

Unhandled Exception:
System.Reflection.ReflectionTypeLoadException:
The classes in the module cannot be
loaded.

I saw that this error is create by the fact that my library is in framework 4.5…

Have you a solution ?

Tic-Tac-Toc.

Unity by default use .Net 2.0 Subset ( a small version with less classes) and can be configured to use .Net 2.0.

You can’t use code from greater versions of .Net.

If you created the dll remake with a 2.0 compilance, else search other way to do what you want.