I created a Website in order to create a Web User Control as a DLL. Something similar to this http://www.nathanblevins.com/2008/06/compile-a-web-user-control-into-a-dll-net-c/

The problem is that i can’t set the version of the assemblies, unlike a web application where i can just go to AssemblyInfo and change the version number. I need to be able to manage the version number as we intend to install the controls to the GAC.

Here’s a how-to page that will teach you how to do just that: http://msdn.microsoft.com/en-us/library/ms228042.aspx