>>I believe that to share the same code base, you need to compile your functions to a DLL and then reference the DLL in your other project.
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>After having tested that, it doesn't work. I created a DLL project. I compiled the DLL. Then, into the other project, I added a reference. Even by adding the reference, it still copies the DLL files into the other project.

That's true. But if you look at the properties of the reference, it still has the source path. I believe .NET will automatically grab a fresh copy of the DLL from the source path when you compile your project.