I think the worst thing you can do about anger is try to suppress it, to bury it behind a fake smile. However I think it's very rare that anger actually accomplishes anything beneficial - in fact, becoming angry will often make your problems worse. Even when you are in the right, if you get angry with someone, you will usually lose the argument. For me, I try to deal with problems before they make me angry: anticipate problems in the future, and deal with them now.