Difference between ClientSideRedirectException and InterruptDispatchException

Hi
  I have a question about the ClientSideRedirectException and InterruptDispatchException.
  I create a "ValidatedLoginEvent" and made it parent of all the other events.If an event such as "LoginEvent" is fired,the parent event will be fired first.When I handles the parent event ,I would throw an Exception for some login errors.Which exception should I use?