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copied!<p>This helped me understand the reasoning:</p> <p>The main difference is, that the value of a normal .NET property is <strong>read directly</strong> from a <em>private member in your class</em>, whereas the value of a DependencyProperty is <strong>resolved dynamically</strong> when calling the <em>GetValue() method that is inherited from DependencyObject</em>.</p> <p>When you set a value of a dependency property it is not stored in a field of your object, but in a <em>dictionary of keys and values</em> provided by the base class DependencyObject. The key of an entry is the name of the property and the value is the value you want to set.</p> <p>The advantages of dependency properties are as follows:</p> <p><strong>Reduced memory footprint</strong></p> <p>It's a huge dissipation to store a field for each property when you think that over 90% of the properties of a UI control typically stay at its initial values. Dependency properties solve these problems by only store modified properties in the instance. The default values are stored once within the dependency property.</p> <p><strong>Value inheritance</strong></p> <p>When you access a dependency property the value is resolved by using a value resolution strategy. If no local value is set, the dependency property navigates up the logical tree until it finds a value. When you set the FontSize on the root element it applies to all textblocks below except you override the value. </p> <p><strong>Change notification</strong></p> <p>Dependency properties have a built-in change notification mechanism. By registering a callback in the property metadata you get notified, when the value of the property has been changed. This is also used by the databinding.</p> <p>From: <a href="http://www.wpftutorial.net/DependencyProperties.html" rel="noreferrer">WPF Tutorials</a>.</p>

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