How do I share user controls between web applications in ASP.NET?

Question

This question is a follow up to my question about sharing resources between web applications, because I have not yet found a good solution.

I have a web application

Answer 1

In order to share controls between web apps, the only way I found was to either rewrite them into server controls or to use virtual directory to make the user controls actually in folder be in each project.

Unfortunately, asp.net doesn't really have a good solution for this. The same is true for sharing master pages.