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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.vb Imports System.Windows Namespace WPFThreading   Public Partial Class BlockThread     Inherits System.Windows.Window     Public Sub New()       InitializeComponent()       Me.UIThreadLabel.Content = Me.Dispatcher.Thread.ManagedThreadId       Me.BackgroundThreadLabel.Content = "N/A"     End Sub     Private Sub button1_click(sender As Object, e As RoutedEventArgs)       System.Threading.Thread.Sleep(5000)       Me.textbox1.Text = "Done Sleeping..."     End Sub     Private Sub button2_click(sender As Object, e As RoutedEventArgs)       Me.textbox1.Text = "Hello WPF"     End Sub   End Class End Namespace