.net version for developing addon

[yecode]

So I am trying to write my first own addon for KSP. After learning from others' code, I found that sometime my code complied but KSP doesn't load it, saying some classes get "ReflectionTypeLoadException". But I fixed this by removing some references and change the .NET version from 4.5 to 3.5.

So do I have to use 3.5 to develop? Is there any tutorials telling me these kind of basic things?

[philotical]

yes 3.5 it is..

I've read it on the forums - like all info for KSP you'll need to search..