Keep the UI from becoming non-responsive in single threaded application which performs a long operation.

     

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Prime Numbers" Width="260" Height="75">
  <StackPanel Orientation="Horizontal" VerticalAlignment="Center" >
    <Button Content="Start" Click="StartOrStop" Name="startStopButton" Margin="5,0,5,0"/>
    <TextBlock Margin="10,5,0,0">Number:</TextBlock>
    <TextBlock Name="numberTextBlock" Margin="4,5,0,0">3</TextBlock>
  </StackPanel>
</Window>
//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Threading
Imports System.Threading

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Delegate Sub NextPrimeDelegate()
    Private num As Long = 1

    Private continueCalculating As Boolean = False

    Public Sub New()
      MyBase.New()
      InitializeComponent()
    End Sub
    Public Sub StartOrStop(sender As Object, e As EventArgs)
      If continueCalculating Then
        continueCalculating = False
        startStopButton.Content = "Resume"
      Else
        continueCalculating = True
        startStopButton.Content = "Stop"
        startStopButton.Dispatcher.BeginInvoke(DispatcherPriority.Normal, New NextPrimeDelegate(AddressOf CheckNextNumber))
      End If
    End Sub
    Public Sub CheckNextNumber()
      numberTextBlock.Text = num.ToString()
      num += 2
      If continueCalculating Then
        startStopButton.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.SystemIdle, New NextPrimeDelegate(AddressOf Me.CheckNextNumber))
      End If
    End Sub
  End Class
End Namespace

1.	Create a multi threaded web browsing application.
2.	Show a Continuous Animation During an Asynchronous Process
3.	Load the Data for a Window Asynchronously After It Has Rendered
4.	Check Whether You Are Running on the UI Thread
5.	Ensure That You Are Running on the UI Thread
6.	A Cancellable ProgressBar While Processing on a Background Thread
7.	Show a Continuous Progress Bar While Processing on a Background Thread
8.	Execute a Method Asynchronously Using the Dispatcher Queue
9.	Thread Sleep in Button Click handler
10.	Execute a Method Asynchronously Using a Background Worker Thread
11.	Track the Progress of a Background Worker Thread
12.	Support the Cancellation of a Background Worker Thread
13.	Create a Background Worker Thread in XAML
14.	WPF Threading
15.	BlockThread.xaml

Keep the UI from becoming non-responsive in single threaded application which performs a long operation. : Thread « Windows Presentation Foundation « VB.Net

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