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    <p>I find that implementing a DependencyProperty often involves four parts:</p> <ul> <li>The DependencyProperty itself</li> <li>Property with get and set</li> <li>Static changed handler</li> <li>Instance change handler</li> </ul> <p>You can add a dependency property to a UserControl so that you can data bind to something in the DataContext where the UserControl is instantiated. For example you could add a property to a SoUserControl:</p> <pre><code> #region SampleProperty // Demo for SO 2424526 public static readonly DependencyProperty SamplePropertyProperty = DependencyProperty.Register("SampleProperty", typeof(int), typeof(SoUserControl), new PropertyMetadata(OnSamplePropertyChanged)); /// &lt;summary&gt; /// Demo for SO 2424526 /// Gets or sets dependency property. /// &lt;/summary&gt; public int SampleProperty { get { return (int)GetValue(SamplePropertyProperty); } set { SetValue(SamplePropertyProperty, value); } } /// &lt;summary&gt; /// Handld changes to SamplePropertyProperty by calling a handler in the associated object. /// &lt;/summary&gt; /// &lt;param name="obj"&gt;object the property is associated with&lt;/param&gt; /// &lt;param name="e"&gt;details of change&lt;/param&gt; static void OnSamplePropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { (obj as SoUserControl).OnSamplePropertyChanged(e); } /// &lt;summary&gt; /// Handle changes to the SamplePropertyProperty dependency property. /// &lt;/summary&gt; /// &lt;param name="e"&gt;details of change&lt;/param&gt; private void OnSamplePropertyChanged(DependencyPropertyChangedEventArgs e) { int SamplePropertyNewValue = (int)e.NewValue; // do something with the internal logic of the control } #endregion </code></pre>
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    1. COThanks for you time and the answer, that is what really need , one think I want to ask you, is how it know that value is changed and it passed to the control to display the changed value. thanks again
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      1. USAsim Sajjad
 

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