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Lesson 19 - Events in C# .NET

In the previous exercise, Solved tasks for OOP in C# .NET lessons 17-18, we've practiced our knowledge from previous lessons.

In the previous lesson, Solved tasks for OOP in C# .NET lessons 17-18, 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.


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.


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
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn university The author learned IT at the Unicorn University - a prestigious college providing education on IT and economics.
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