问题
I created a UserControl in .Net 4.0 App, and now I need that UserControl in another App which is in .Net 2.0 environment. Is it possible to use my UserControl in the .Net 2.0 App (VS 2005)?
回答1:
One does not simply use .NET 4 in an older environment.
回答2:
No, but the other way around works, .net2 -> .net4
If you're not using any features above .net2, you could recompile with net2.0 as target platform.
来源：https://stackoverflow.com/questions/10332550/use-net-4-0-usercontrol-in-net-2-0