How to make a MessageBox show during a .NET build?

Question

I use a 3rd party control that (if not licensed) shows a dialog box when building a project that references their dll. Although this is super annoying, it made me wonder how they did that? Any ideas?

Answer 1

Probably using the standard MS licensing infrastructure: http://msdn.microsoft.com/en-us/library/fe8b1eh9(VS.71).aspx