Execute a Method Asynchronously Using the Dispatcher Queue

    
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Width="220" Height="104" >
    <StackPanel Orientation="Vertical">
        <Button Click="StartStop_Click" Name="btnStartStop">Start</Button>
        <StackPanel Orientation="Horizontal">
            <TextBlock>Biggest Prime Found:</TextBlock>
            <TextBlock Name="txtNumber"/>
        </StackPanel>
    </StackPanel>
</Window>

//File:Window.xaml.vb

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


Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private continueCalculating As Boolean = False

    Public Sub New()
      MyBase.New()
      InitializeComponent()
    End Sub

    Private Sub StartStop_Click(sender As Object, e As RoutedEventArgs)
      If continueCalculating Then
        continueCalculating = False
        btnStartStop.Content = "Start"
      Else
        continueCalculating = True
        btnStartStop.Content = "Stop"
        Me.Dispatcher.BeginInvoke(DispatcherPriority.Normal, New Action(Of Integer)(AddressOf UpdateNumber), 3)
      End If
    End Sub

    Public Sub UpdateNumber(current As Integer)
      txtNumber.Text = current.ToString()
      If continueCalculating Then
        Me.Dispatcher.BeginInvoke(DispatcherPriority.SystemIdle, New Action(Of Integer)(AddressOf UpdateNumber), current + 2)
      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.	Thread Sleep in Button Click handler
9.	Execute a Method Asynchronously Using a Background Worker Thread
10.	Track the Progress of a Background Worker Thread
11.	Support the Cancellation of a Background Worker Thread
12.	Create a Background Worker Thread in XAML
13.	WPF Threading
14.	BlockThread.xaml
15.	Keep the UI from becoming non-responsive in single threaded application which performs a long operation.

Execute a Method Asynchronously Using the Dispatcher Queue : Thread « Windows Presentation Foundation « VB.Net

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