Lesson 19 - Events in C# .NET

C# .NET OOP Events in C# .NET

In the previous lesson, Delegates, anonymous methods and lambda expressions in C#, we learned about delegates in C# .NET. In today's tutorial, we're going to go over what events are. This lesson will help you understand how event handling in (windows) form applications works and how to create events in your classes.

Events

Sometimes, we need to respond to an event in the program. A great practical example is form applications. When we click on a button, a handler method is called and performs an action. We could come up with many events, e.g. minimizing the window, moving the mouse or even losing the internet connection. Without knowledge of event principles, or even delegates, we would probably still be able to create an application of the sort anyway. However, it would be very confusing and most would likely make it difficult to add or modify events.

Event

An event is a delegate with one extra feature


 

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In this tutorial, we'll introduce events and the EventHandler delegate. As an example, we will have a listener react to instance changes.
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Article has been written for you by David Capka
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