Check Whether You Are Running on the UI Thread

    

<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" Height="120" Width="364">
    <StackPanel>
        <Button Click="ButtonTrue_Click">UI Thread</Button>
        <Button Click="ButtonFalse_Click">Non-UI Thread</Button>
        <TextBlock x:Name="txtResult"/>
    </StackPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System.Windows.Threading

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private Delegate Sub CheckAccessDelegate()
    Private Delegate Sub SetResultTextDelegate(result As String)
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub ButtonTrue_Click(sender As Object, e As RoutedEventArgs)
      CheckAccess()
    End Sub

    Private Sub ButtonFalse_Click(sender As Object, e As RoutedEventArgs)
      Dim del As New CheckAccessDelegate(AddressOf CheckAccess)
      del.BeginInvoke(Nothing, Nothing)
    End Sub

    Private Overloads Sub CheckAccess()
      If txtResult.Dispatcher.CheckAccess() Then
        txtResult.Text = "True"
      Else
        txtResult.Dispatcher.BeginInvoke(DispatcherPriority.Normal, New SetResultTextDelegate(AddressOf SetResultText), "False")
      End If
    End Sub

    Private Sub SetResultText(result As String)
      txtResult.Text = result
    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.	Ensure That You Are Running on the UI Thread
5.	A Cancellable ProgressBar While Processing on a Background Thread
6.	Show a Continuous Progress Bar While Processing on a Background Thread
7.	Execute a Method Asynchronously Using the Dispatcher Queue
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.

Check Whether You Are Running on the UI Thread : Thread « Windows Presentation Foundation « VB.Net

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