I am working with updating groups programmatically and have been wondering how SPGroup's react when you:
a) Try to remove people that are not already a member - silently fail, throw exception, ??
b) Try to add a person to a group he is already a member of - again, with what outcome.
Since MSDN do not document Exception-handling (at all) I tried google but I can't seem to find any articles with my google-fu that will give me the right answer.
Any and all help is appreciated.