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<p>A simple/fundamental difference - Change Notification: Changes to Dependency Properties are reflected/refreshed in UI on changes whereas CLR properties don't. </p> <pre><code><Window x:Class="SampleWPF.MainWindow" x:Name="MainForm" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:SampleWPF" Title="About WPF Unleashed" SizeToContent="WidthAndHeight" Background="OrangeRed" > <StackPanel DataContext="{Binding ElementName=MainForm}">  <Label Name="txtCount1" FontWeight="Bold" FontSize="20" Content="{Binding ElementName=MainForm, Path=Count1, Mode=OneWay}" />  <Label Name="txtCount2" Content="{Binding ElementName=MainForm, Path=Count2, Mode=OneWay}"></Label>  <Label Name="txtCount3" FontWeight="Bold" FontSize="20" Content="{Binding Count1}" />  <local:UserControl1 />  <local:UserControl2 /> <TextBox Text="{Binding ElementName=txtCount1, Path=Content}" ></TextBox> <TextBox Text="{Binding ElementName=txtCount2, Path=Content}" ></TextBox> <Button Name="btnButton1" Click="btnButton1_Click_1">Increment1</Button> <Button Name="btnButton2" Click="btnButton1_Click_2">Increment2</Button> </StackPanel> </Window> <UserControl x:Class="SampleWPF.UserControl1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"> <StackPanel> <Label Content="{Binding Count1}" ></Label>  </StackPanel> </UserControl> <UserControl x:Class="SampleWPF.UserControl2" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"> <StackPanel> <Label Content="{Binding Count2}" ></Label>  </StackPanel> </UserControl> </code></pre> <p>And the code behind here (To declare the CLR and Dependency property):</p> <pre><code> using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace SampleWPF { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public static readonly DependencyProperty Count1Property; private int _Count2 = 2; public int Count2 { get { return _Count2; } set { _Count2 = value; } } public MainWindow() { return; } static MainWindow() { // Register the property MainWindow.Count1Property = DependencyProperty.Register("Count1", typeof(int), typeof(MainWindow), new FrameworkPropertyMetadata(1, new PropertyChangedCallback(OnCount1Changed))); } // A .NET property wrapper (optional) public int Count1 { get { return (int)GetValue(MainWindow.Count1Property); } set { SetValue(MainWindow.Count1Property, value); } } // A property changed callback (optional) private static void OnCount1Changed( DependencyObject o, DependencyPropertyChangedEventArgs e) { } private void btnButton1_Click_1(object sender, RoutedEventArgs e) { Count1++; } private void btnButton1_Click_2(object sender, RoutedEventArgs e) { Count2++; } } } </code></pre> <p>Another feature provided by Dependency Properties is value inheritance - value set in top level elements propagates down the element tree - In following example taken from <a href="http://en.csharp-online.net" rel="nofollow">http://en.csharp-online.net</a>, FontSize and FontStyle declared on "Window" tag is applied to all child elements underneath:</p> <pre><code><Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" Title="About WPF Unleashed" SizeToContent="WidthAndHeight" FontSize="30" FontStyle="Italic" Background="OrangeRed"> <StackPanel> <Label FontWeight="Bold" FontSize="20" Foreground="White"> WPF Unleashed (Version 3.0) </Label> <Label>© 2006 SAMS Publishing</Label> <Label>Installed Chapters:</Label> <ListBox> <ListBoxItem>Chapter 1</ListBoxItem> <ListBoxItem>Chapter 2</ListBoxItem> </ListBox> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <Button MinWidth="75" Margin="10">Help</Button> <Button MinWidth="75" Margin="10">OK</Button> </StackPanel> <StatusBar>You have successfully registered this product.</StatusBar> </StackPanel> </Window> </code></pre> <p><strong>References:</strong> <a href="http://www.codeproject.com/Articles/29054/WPF-Data-Binding-Part-1" rel="nofollow">http://www.codeproject.com/Articles/29054/WPF-Data-Binding-Part-1</a> http://en.csharp-online.net/WPF_Concepts%E2%80%94Property_Value_Inheritance</p>
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