Microsoft Visual Studio 2015 Unleashed, Third Edition

Creating and Raising Events

There is not much functionality you can build using the .NET languages without events. Events enable one piece of code to notify another bit of code that something has just happened. Code that raises events is said to publish an event, and code that receives the event notice is said to subscribe to events. A simple example is when you write a user interface for the Web or Windows. In these cases, you are consistently adding code that subscribes to events published by the UI, such as a user clicking a button control. Of course, an event may have more than a single subscriber, and subscribers may subscribe to multiple events.

Define an Event

When you define an event you need to determine whether you need to pass custom ...