After changing namespace in UserControl files, …g.cs files get errors

Question

I copied three classes in from another WPF project and then changed their namespaces.

Now when I run the project, I get errors in the \".g.cs\"

Answer 1

Another possible cause is if you have any xmlns:xx namespaces in your xaml which you neglected to update when changing a namespace, then this will also cause an invalid using statement in the g.cs file.