# C1.WPF.Extended.C1Book.OnPropertyChanged

## Content

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<h1 id="C1_WPF_Extended_C1Book_OnPropertyChanged_" data-uid="C1.WPF.Extended.C1Book.OnPropertyChanged*">OnPropertyChanged Method
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<div class="markdown level0 conceptual"></div>



<a id="C1_WPF_Extended_C1Book_OnPropertyChanged_" data-uid="C1.WPF.Extended.C1Book.OnPropertyChanged*"></a>
<h4 id="C1_WPF_Extended_C1Book_OnPropertyChanged_System_Windows_DependencyPropertyChangedEventArgs_" data-uid="C1.WPF.Extended.C1Book.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs)">OnPropertyChanged(DependencyPropertyChangedEventArgs)</h4>
<div class="markdown level1 summary"><p>Invoked whenever the effective value of any dependency property has been updated.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)</code></pre>
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  <pre><code class="lang-vbnet hljs">Protected Overrides Sub OnPropertyChanged(e As DependencyPropertyChangedEventArgs)</code></pre>
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<h5 class="parameters">Parameters</h5>
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      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.windows.dependencypropertychangedeventargs">DependencyPropertyChangedEventArgs</a></td>
      <td><span class="parametername">e</span></td>
      <td><p>The event data that describes the property that changed, as well as old and new values.</p>
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    </tr>
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<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.windows.frameworkelement.onpropertychanged">FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs)</a></div>
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