Problem with GLUquadric

I have a problem with compiling projects under MS VS.NET using gluQuadric objects.

Basically, I have found that code that I have downloaded compiles well, but the code I have written does not.

I get a run time error message, as follows:
Unhanlded Exception: System.TypeLoadException: Could not load type GLUquadric from assembly

Does anyone have a solution to this?