Events
are closely related to delegates, but they are not the same thing. An event
allows code to subscribe and unsubscribe using delegate instances as event
handlers. The idea is that when an event is raised all the event handlers which
have subscribed to the event are called. Just as a property is logically just
two operations get and set, an event is also logically just two operations:
subscribe and unsubscribe.
To
declare an event and explicitly write these operations, you use syntax which
looks like a property declaration but with add...
