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Listen to DataContent changed event

<Window x:Class="WpfApplication1.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="Window1" Height="100" Width="200">   <StackPanel>     <TextBox x:Name="tbxUserText" Text="Enter some text..."/>     <Button Click="Button_Click" Content="Update DataContext"/>   </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; using System; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();             DataContextProperty.OverrideMetadata(                 typeof(Window1),                  new FrameworkPropertyMetadata(                         100d,                          new PropertyChangedCallback(DataContext_PropertyChanged)));         }         private static void DataContext_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)         {             string msg = string.Format("DataContext changed.{0}{0}Old Value: {1}{0}New Value: {2}",                               Environment.NewLine,                               e.OldValue.ToString(),                                e.NewValue.ToString());             MessageBox.Show(msg, "changed");         }         private void Button_Click(object sender, RoutedEventArgs e)         {             DataContext = tbxUserText.Text;                     }     } }