I'm developing a C#/VB/Javascript compatible Test Script edit/run/
debug environment, need both a compiler and an interpreter.

I looked into SharpDevelop, an open source project as an IDE for C#/
VB, their forum says "The compiler(s) is/are, by default,
Microsoft's, but Mono can be used as well. I believe #develop
attaches to a Microsoft debugger for debug purposes."

But how could you talk with a Microsoft debugger? To retrieve the
"Step by Step", "Watch", "Call Stack" information from Microsoft
debugger to present in the UI? That would be very helpful for our
project. Please provide more information, some keywords or links
please!