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ThreadPool QueueUserWorkItem

<Window x:Class="DispatcherExamples.MyWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Use BeginInvoke" Height="300" Width="300"     >     <Grid>       <StackPanel>         <Button x:Name="useBeginInvokeButton" Content="Use BeginInvoke" />       </StackPanel>     </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; using System.Threading; namespace DispatcherExamples {     public partial class MyWindow : System.Windows.Window     {         public MyWindow()         {             InitializeComponent();             useBeginInvokeButton.Click += new RoutedEventHandler(useBeginInvokeButton_Click);         }         void useBeginInvokeButton_Click(object sender, RoutedEventArgs e)         {             ThreadPool.QueueUserWorkItem(delegate             {                 MyDelegateType methodForUiThread = delegate                 {                     this.Background = new SolidColorBrush(Color.FromRgb(3,2, 1));                 };                 this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, methodForUiThread);             });         }         public delegate void MyDelegateType();     } }