Problem: "Drawing" and "Windows" not recognised

I tried to compile a .cs file that includes the directives "using
System.Drawing;" and "using System.Windows.Forms; ", but Mono gives two
error messages: 

"The type or namespace 'Drawing' does not exist in the namespace 'System'.
Are you missing an assembly reference?"
"The type or namespace 'Windows' does not exist in the namespace 'System'.
Are you missing an assembly reference?"

I managed to compile the same file in Visual Studio, so I wonder what I need
to do in order to have files of this kind compiled in Mono too?

If anyone can help me with this, thank you in advance.
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