WPF C#

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="100" Width="300">
    
        UI Thread
        Non-UI Thread
    


//File:Window.xaml.cs
using System.Windows;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void ButtonTrue_Click(object sender, RoutedEventArgs e)
        {
            this.Dispatcher.VerifyAccess();
        }
        private void ButtonFalse_Click(object sender, RoutedEventArgs e)
        {
            VerifyAccessDelegate del = new VerifyAccessDelegate(VerifyAccess);
            del.BeginInvoke(null, null);
        }
        private delegate void VerifyAccessDelegate();
        private void VerifyAccess()
        {
            this.Dispatcher.VerifyAccess();
        }
    }
}