What .NET Framework and C# version should I target with my class library?

Question

I\'m building a DLL class library - I want to make it usable by as many people as possible. Which version of the .NET Framework and which C# version should I use? Is it po

Answer 1

Combined with using an approach like the one mentioned by Will Hughes, if you want the access / option to use newer features when available, during active development, use the latest framework. When ready to start making release candidates, set to the lowest framework, and then when issues arrive, steadily bump up the framework version and / or use the #ifdef approach to work out.