How do I close all open forms?

You can close all open forms in your application by calling the AppDesktop.CloseAllForms method.

For example, in C#:

AppDesktop.CloseAllForms();

And in VB .NET:

AppDesktop.CloseAllForms()

If you pass a true to CloseAllForms, it forces all forms to close even if the user has pending changes that haven't been saved yet (which causes the pending changes to be lost).