VS.NET Pro vs VS.Net Dev Edition

STupid question..
I’m completely new to .Net, so go easy on me for this. Will the Pro edition of VS.NET allow me to create DLL’s ? I’ve been looking everywhere and am just not finding a clear answer. As well, if I have a web application using DLL’s, would I be able to modify said application with the Pro version. No way my company will pay for Dev edition. Thanks to anyone who can help me !!!