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Property changed callback

<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="300" Width="300">     <StackPanel>       <TextBox x:Name="uv" Text="{Binding Path=UserValue, UpdateSourceTrigger=PropertyChanged}"                 />     </StackPanel> </Window> //File:Window1.xaml.cs using System.Windows; using System.Windows.Controls; using System.Windows.Media; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();             DataContext = this;         }         private static void UserValue_PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)         {             Window1 window1 = d as Window1;             if (window1 != null)             {                                 window1.uv.Foreground = Brushes.SeaGreen;             }         }     } }