Dispatcher.BeginInvoke with DispatcherPriority.Normal

   
  

<Window x:Class="DispatcherExamples.UseVerifyAccess"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="DispatcherExamples" Height="300" Width="300"
    >
    <Grid>
        <StackPanel>
            <Button Content="Call from UI Thread" x:Name="fromUiButton" />
            <TextBlock x:Name="result" TextWrapping="Wrap" />
        </StackPanel>
    </Grid>
</Window>
//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Threading;
using System.Windows.Threading;

namespace DispatcherExamples
{
    public partial class UseVerifyAccess : System.Windows.Window
    {

        public UseVerifyAccess()
        {
            InitializeComponent();

            fromUiButton.Click += new RoutedEventHandler(fromUiButton_Click);
        }

        void fromUiButton_Click(object sender, RoutedEventArgs e)
        {
            string resultText;
            try
            {
                resultText = "Success";
            }
            catch (Exception x)
            {
                resultText = x.ToString();
            }
            Dispatcher.BeginInvoke(DispatcherPriority.Normal, (ThreadStart)delegate
            {
                result.Text = resultText;
            });
        }
    }
}