Async Progress Bar

<Window x:Class="HDI_WPF_AsyncProgressBar_cs.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="400" Width="400">
    <Grid>
        <StackPanel>
            <Button x:Name="btnBegin" HorizontalAlignment="Center" Content="Start Long Process" Click="btnBegin_Click" />
            <Button x:Name="btnInteract" HorizontalAlignment="Center" Content="Interact with UI" Click="btnInteract_Click" />
        </StackPanel>
        <Border x:Name="bdrProgress" Visibility="Hidden" Background="BurlyWood" CornerRadius="10" BorderBrush="DarkGray" BorderThickness="1" HorizontalAlignment="Center" VerticalAlignment="Center">
            <StackPanel>
                <Grid Margin="5">
                    <ProgressBar x:Name="prgProgress" Width="200" Height="20" Minimum="0" Maximum="1" />
                    <TextBlock x:Name="txtProgress" HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Grid>
                <Button x:Name="btnCancel" Content="Cancel" HorizontalAlignment="Right" Margin="3" Click="btnCancel_Click" />
            </StackPanel>
        </Border>
    </Grid>
</Window>

 

public partial class Window1 : Window
    {
        int counter = 0;
        bool iscanceled = false;

        public Window1()
        {
            InitializeComponent();
        }

        private void btnBegin_Click(object sender, RoutedEventArgs e)
        {
            bdrProgress.Visibility = Visibility.Visible;
            new Thread(
                delegate()
                {
                    DoLongRunningProcess();
                }
                ).Start();
        }

        private void btnInteract_Click(object sender, RoutedEventArgs e)
        {
            this.Title = counter++.ToString();
        }

        private void btnCancel_Click(object sender, RoutedEventArgs e)
        {
            this.iscanceled = true;
        }

        private void DoLongRunningProcess()
        {
            Thread.Sleep(2000);
            if (!iscanceled)
            {
                Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { prgProgress.SetValue(ProgressBar.ValueProperty, .5); }, null);
                Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { txtProgress.SetValue(TextBlock.TextProperty, "50%"); }, null);
                Thread.Sleep(2000);
                if (!iscanceled)
                {
                    Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { prgProgress.SetValue(ProgressBar.ValueProperty, 1.0); }, null);
                    Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { txtProgress.SetValue(TextBlock.TextProperty, "100%"); }, null);
                }
            }
            Dispatcher.BeginInvoke(DispatcherPriority.Background, (SendOrPostCallback)delegate { bdrProgress.SetValue(Border.VisibilityProperty, Visibility.Collapsed); }, null);
        }
    }