Is C# compiler open source? [closed]

Question

Is C# compiler open source?

Answer 1

At Build 2014, Microsoft announce that their next generation of compilers codenamed "Roslyn" would be made open source and be available on Github.

The legacy C# compiler from Microsoft is not open source, although it is freely available through Visual Studio Express or the .NET Framework SDK. However there are freely available, open source, C# compilers out there. Check out Mono

Answer 2

SSCLI, otherwise known as Rotor, is a shared source version of the CLI + build tools from Microsoft. Also Blue (as answered by SnapConfig.com) is also a C# compiler written in C#