DirectX to GDI

hi.. group,

Is there a easy way (or a safe way, whatever you call it) to transfer a
DirectX output to GDI image?

For example:

Somebody draws a rectangle using DirectX with C++. I need to implement this
rectange with GDI using C#. Is there a way I can copy and paste some code
from him? Maybe I can grab DirectX output and transform it to GDI.

My goal is simple: I do not want to rewrite the same code again..

Not sure if I explain my question clear.. thanks guys.