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Visual C#® 2012: How to Program, Fifth Edition by Harvey Deitel, Paul Deitel

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14.3. Event Handling

Normally, a user interacts with an app’s GUI to indicate the tasks that the app should perform. For example, when you write an e-mail in an e-mail app, clicking the Send button tells the app to send the e-mail to the specified e-mail addresses. GUIs are event driven. When the user interacts with a GUI component, the interaction—known as an event—drives the program to perform a task. Common events (user interactions) that might cause an app to perform a task include clicking a Button, typing in a TextBox, selecting an item from a menu, closing a window and moving the mouse. All GUI controls have events associated with them. Objects of other types can also have associated events as well. A method that performs a task in response ...

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