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Is it possible to write a .dll file that will work in revolution in a .net language? More specifically c#

Not directly, I'm afraid; but you could write an external that loads the CLR (Common Language Runtime) to set everything up for calling into .NET code.
I have written something similar for Java - an external that allows you to load a Java Virtual Machine and execute code in it, calling back to Rev when needed. So it can be done, but it's a challenge

Jan Schenkel.