Events
An event is a notification. By necessity, this definition is broad. Events encompass a wide range of occurrences and actions. Here is a description of some predefined events, which underscores the breadth of activities. A button-click event notifies a form that a button has been clicked. A timer event is a notification that a set period of time has elapsed. The unhandled exception event of the application domain is a notification of a fatal exception. The Application_Start event notifies a Web application that the application is loading. You also can create custom events for a variety of purposes. Typically an event is exposed as a member of a publisher class, such as a button class.
Anyone interested in an event can subscribe to that event. ...
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