compiling into a dll from studio 2005 IDE

Question

Hi, I'm a bit new with this so I'm in need of help in compiling a dll. I made a project but decided to put most of my code in a separate class inside the same project. But when I run the project it just run and generate the exe file under the debug folder. Can someone help me how can I compile the class into dll and have it compiled at the moment I run the project. Thanks