VB.Net Sharing a Single copy of a source file

Question

Hello all. I'm new here and been trying to get an answer on this rather basic question.

I have a VB6 project group, in that group I have two projects a testing project and the class project.  I have a single source file shared between them call MiscUtils.bas.  In VB6 I could edit that module and both projects were kept in sync with the changes.  Also this same module is used by twenty other projects and still there is only 1 MiscUtils.bas on my computer.

Now that I have joined the ranks of .Net it seems that this is not possible. I have the VB.Net Express 2008. Every project seems to for some reason get it's own independent copy of MiscUtil.vb.  I seem to have this happen even if I specifically add the module from within the project as an existing module.  I see a copy of the source in the project folder and changes I make in one project do not appear when I open a different project using that same .vb source file.

It's really a pain to adjust one of the routines for VB.Net and then must remember all the projects that are currently using the file and then update each. 

Ok I had it suggested to make a Class out the the routines.... Sometimes the overhead hit makes this approach not so good.  I have code that users complain about hung systems and reboot if response is not instant.  Often the code I run is against 500+ records and on 15 fields of validation with External Web access on each record.  A moving progress bar still does not help.  So every millisecond I can save helps.  In some projects I actually include the classes I would normally have used via a DLL just to save execution time. I certainly do not want to use outdated code for those classes just because I forgot to copy the class to the project folder on the other apps that use it.  Same goes for modules.