Managed and unmanaged code

Question

Each .NET language has its own complier. when we write a code in C#, C# complier converts it into MSIL. Then JIT converts this code into machine dependent code.

My question is:
IF we write a code in any .NET language, is it managed code?
IF we do not write a code in any .NET language, is it unmanaged code?

What's difference/usage of two?