In which language is each Mono component developed?

Question

According to Wikipedia, Mono has three main components:

• Core components
• Mono/Linux/GNOME development stack
• Microsoft compatibility stack

I want to know what the language or technology each one of those components is developed in.

EDIT:
I know that the some portions of the project is developed in C#, especially the old ones, but I want to know if the WHOLE project is developed in C#, or not.

Answer 1

The runtime itself is written in C. The different class libraries and tools, as well as the C# compiler are entirely written in C#.

The only exception is the VB compiler and VB libraries that are written, well, in VB.