无论版本如何，我如何引用DLL？

Okay, I am a heavy user of Telerik's library of controls, specifically for ASP.NET. However, there is a small bit of functionality which I wanted to add to some of the controls. Nowadays I can do this easy enough using Extension methods. So I wrote a small library which does exactly that. Obviously, this library needs to reference their DLL (Okay, I am a heavy user of Telerik's library of