Another thing to do, after you've made a reference to the DLL or project, is to use the using statement to include the namespace included in that DLL file. It's not absolutely required, but it does simplify using methods and classes from the DLL, rather than having to type out the fully qualified name of the method/class.

As a handy tip, you can use object explorer to look through a DLL's functions to determine what you're wanting to use.