Hello,
Up until now I've had all my code in code behind files or class files that were in the App_Code directory of the website. Well, with a new project I'm working on I created a seperate project in Visual Web Developer and put all my class files and datasets in that project and build it to a DLL.
I then add a reference to that DLL by browsing to the debug/bin folder of the project and any website locally will work...