WPF Threading
<Window x:Class="WPFThreading.BlockThread" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="UI Thread Blocker" Height="300" Width="250"> <StackPanel> <Button Name="button1" Click="button1_click">Go to sleep</Button> <Button Name="button2" Click="button2_click">Try Me</Button> <TextBox Name="textbox1"/> <Label Name="UIThreadLabel"/> <Label Name="BackgroundThreadLabel"/> </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; namespace WPFThreading { public partial class BlockThread : System.Windows.Window { public BlockThread() { InitializeComponent(); this.UIThreadLabel.Content = this.Dispatcher.Thread.ManagedThreadId; this.BackgroundThreadLabel.Content = "N/A"; } private void button1_click(object sender, RoutedEventArgs e) { System.Threading.Thread.Sleep(5000); this.textbox1.Text = "Done Sleeping..."; } private void button2_click(object sender, RoutedEventArgs e) { this.textbox1.Text = "Hello WPF"; } } }