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the unreal engine uses c# for development?

the unreal engine uses c# for development i can use to develop my games its possible?

No, it uses C++.

Some members are considering writing some wrappers to enable C# dev, but don’t expect anything useful anytime soon.

If you know C# you can pick up C++ fairly easily. Check out the C++ courses on pluralsight.com

C# code that you can find in sources are builder scripts and they are used in code project building, engine it self as said above does not use C# (or rather .NET-based byte code)

Now there is mono for UE: http://mono-ue.github.io/