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Using a DispatcherTimer

<Window x:Class="DispatcherExamples2.MyWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="DispatcherTimer" Height="300" Width="300">     <Grid>              </Grid> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; 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.Shapes; using System.Windows.Threading; namespace DispatcherExamples2 {     partial class MyWindow : Window     {         DispatcherTimer dt = new DispatcherTimer();         public MyWindow()         {             InitializeComponent();             dt.Tick += dt_Tick;             dt.Interval = TimeSpan.FromSeconds(2);             dt.Start();         }         void dt_Tick(object sender, EventArgs e)         {             Random rnd = new Random();             byte[] vals = new byte[3];             rnd.NextBytes(vals);             Color c = Color.FromRgb(vals[0], vals[1], vals[2]);             this.Background = new SolidColorBrush(c);         }     } }