Can I integrate C and C# code?

Hi,

Is it possible to integrate some existing C code into a C# program? If possible, what method would I use to integrate it? Should I put it into a class? How would I include the libraries so the compiler recognizes that the code is C? Any additional information would be greatly apprecaited.

Thanks.
Steve

Sorry about posting in two boards. I should have read the guidlines. I was hoping that if the C# programmers didn't have experience in this, maybe the C programmers would.

Continued here.