How to create DLL for form?

Question

C++ / C#

How to create a DLL to work with a form, for example, I can send the values ​​​​from the form to the DLL and the DLL will simply display a messagebox with the values ​​\u200b\u200btransmitted. And the most important thing is that it compiles the DLL, and I can just connect it (normal DLL)

Answer 1

You create a new project in your solution and make a reference to the project. It will then be compiled into a dll