Success message from Controller to View

Question

The goal

I want to display in my view some message when some user is added.

The problem

When something goes wrong in our model, there is a method

Answer 1

Conceptually, I think the answer still holds. If the message is an integral part of the view, it should be part of the ViewModel. TempData is a shortcut for passing data without modifying the ViewModel definition, which some people frown upon.