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Up to this point in the text, most of the applications you developed added various bits of code to Main(), which, in some way or another, sent requests to a given object. However, many applications require that an object be able to communicate back to the entity that created it using a callback mechanism. While callback mechanisms can be used in any application, they are especially critical for graphical user interfaces in that controls (such as a button) need to invoke external methods under the correct circumstances (when the button is clicked, when the mouse enters the button surface, and so forth).
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- Delegates, Events, and Lambda Expressions
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- Chapter 10