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Digital Clock

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          xmlns:src="clr-namespace:MyNameSpace.DigitalClock"         Title="Digital Clock"         SizeToContent="WidthAndHeight">     <Window.Resources>         <src:ClockTicker1 x:Key="clock" />     </Window.Resources>     <Window.Content>         <Binding Source="{StaticResource clock}" Path="DateTime" />     </Window.Content> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Threading; namespace MyNameSpace.DigitalClock {     public class ClockTicker1 : DependencyObject     {         public static DependencyProperty DateTimeProperty =                  DependencyProperty.Register("DateTime", typeof(DateTime),                                              typeof(ClockTicker1));                  public DateTime DateTime         {             set { SetValue(DateTimeProperty, value); }             get { return (DateTime) GetValue(DateTimeProperty); }         }         public ClockTicker1()         {             DispatcherTimer timer = new DispatcherTimer();             timer.Tick += TimerOnTick;             timer.Interval = TimeSpan.FromSeconds(1);             timer.Start();         }         void TimerOnTick(object sender, EventArgs args)         {             DateTime = DateTime.Now;         }     } }