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You need to be careful when handling this event because every time this event is raised, a Click event will have been raised immediately before it This means you must handle either this event or the Click event This event is raised when the control becomes active either because the user presses Tab to enter it, the programmer calls Select or SelectNextControl, or the user clicks it with the mouse Typically, you use this control to draw attention to the fact that the control is active; for example, you might set the background to a different color Note that this event is suppressed on the Form class, where you should use Activated instead This event is raised when the control is deactivated either because the user presses Tab to leave it, the programmer calls Select or SelectNextControl, or the user clicks another control with the mouse.

Note When overriding a method, it s a good practice to call the base class implementation, which may

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In this chapter s examples, the get and set parts of the properties always had the same scope. However, properties can have mixed scope; that is, the get and set parts can have different scopes. Scope splitting works only if you specify both the get and set parts of the property. The idea behind splitting the scope is to enable the implementation of the logic where classes in the inheritance chain are allowed to assign a property, and classes external to the inheritance chain are allowed only to read the property. The following is an example where a property is declared as public and the assignment of the property is protected. class PropertyScopeExample { int _value; public int Value { protected set { _value = value; } get { return _value; } } }

have some required functionality. More commonly, the base class implementation simply raises the associated event (in this case, KeyPress), allowing other objects to handle it. You ll learn more about overriding methods when you build derived controls in 11.

This design pattern is useful if you use a number of controls with extremely similar behavior. It allows you to create a custom control that you can use whenever you need this set of features. If, on the other hand, you need to fine-tune behavior for distinct, even unique tasks, this approach is much less useful. For example, consider a button control. You could

In this chapter s example, the keyword abstract was used to declare a class that could be referenced, but not instantiated. It is also possible to use the abstract keyword to define methods

You might be tempted to use this event for validation, but you should use the Validating and Validated events, instead This event is suppressed on the Form class, where you should use Activated instead This event is part of a sequence of events that you can use to get detailed information about the state of the keyboard To get details about when a key is first pressed, use KeyDown; to find out when it is released, use KeyUp This event is raised whenever a user moves the control This event is useful for finding out whether the mouse is hovering over a control; you can use it to give a user more information about the control The events MouseEnter and MouseLeave are also useful for this.

react to a button click by creating a special class for every button on your application, and giving each button its own overridden OnClick() method. Although your program would still work well, it would quickly become completely disorganized, swamped by layers of button classes that have little to do with one another. To circumvent this problem, .NET uses the view-mediator pattern, as described in the next section.

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