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Binding Dependency Property to TextBlock

<Window x:Name="winThis" x:Class="WpfApplication1.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="Create a Read-Only Dependency Property" Height="300" Width="300">     <Grid>       <Viewbox>         <TextBlock Text="{Binding ElementName=winThis, Path=Counter}" />       </Viewbox>     </Grid> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Threading; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();             DispatcherTimer timer =                  new DispatcherTimer(TimeSpan.FromSeconds(1),                                      DispatcherPriority.Normal,                                      delegate                                      {                                         int newValue = Counter == int.MaxValue ? 0 : Counter + 1;                                         SetValue(counterKey, newValue);                                      },                                      Dispatcher);         }         public int Counter         {             get { return (int)GetValue(counterKey.DependencyProperty); }         }         private static readonly DependencyPropertyKey counterKey =              DependencyProperty.RegisterReadOnly("Counter",                                                  typeof(int),                                                  typeof(Window1),                                                  new PropertyMetadata(0));     } }