Are class diagrams automatically updated? If not, is it possible to do this?

Question

Are class diagrams automatically updated?

If not, is it possible to do this, so new classes are automatically added and removed/renamed classes are removed from the class diagram? Maybe there's a plugin for this?

Answer 1

Yes, the class diagrams in Visual Studio are kept in sync with the code. You can very easily verify this.

What's more, a class can appear in more than one diagram. All diagrams and the code are synced.