Is it possible to customize access modifiers behaviour?

I would use the internal modifier for the setter. This makes it only accessible inside the assembly. If the CustomerUserControl is in another assembly then you can use the InternalsVisibleToAttribute.

As far as I know, there's no way to apply what you're asking for directly to a property setter, since it doesn't know where the call initiated from. However, you could cobble something together using mutator methods.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.