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    <p>From my use with Dependency Properties. They become most important when binding. When you bind to display a regular property, the initial binding will work great, however, the UI will not always update when the property changes, in which case you could implement INotifyPropertyChanged on your class and raise a the NotifyPropertyChanged event, but a Dependency Property will update for you without implementing INotifyProperty Changed.</p> <p>Triggers is another big one. If you wish to create a Trigger to fire off a WPF Animation whenever one of your properties is set to a certain value... then you need to be triggering off of a dependency property.</p> <p>DepenedencyProperties can only be implemented on types that derive from DependencyObject. UIElement derives from Visual which derives from DependencyObject, so most properties from .Net controls are dependency properties already. And when creating and registering my own DependencyProperties it's usually on my custom UserControls as that inherits from UIElement.</p> <p>It was very frustrating for me when I first tried to create a dependency property on one of my regular classes (you're better off using INotifyPropertyChanged here)</p> <p>Links: <a href="http://msdn.microsoft.com/en-us/library/ms752914.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ms752914.aspx</a>, <a href="http://www.wpftutorial.net/DependencyProperties.html" rel="nofollow noreferrer">http://www.wpftutorial.net/DependencyProperties.html</a></p>
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