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Event Dispatcher with Thread

Event Dispatcher with Thread
    

<UserControl x:Class='SilverlightApplication3.MainPage'
    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>

    <Grid x:Name="LayoutRoot" Background="White">

        <Grid.ColumnDefinitions>
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>

        <TextBlock x:Name="tbOutput"
                   Width="200"
                   Height="20" 
                   Grid.Column="0"
                   Grid.Row="0" />

        <Button x:Name="btnStart"
                Width="100"
                Height="20"
                Grid.Column="0"
                Grid.Row="1"
                Content="Start" 
                Click="btnStart_Click" />

    </Grid>

</UserControl>

//File: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Threading;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, RoutedEventArgs e)
        {
            ThreadStart ts = new ThreadStart(DoLongRunningTask);
            Thread thread = new Thread(ts);
            thread.Start();
        }

        private void DoLongRunningTask()
        {
            const int SECONDS = 1000;
            Thread.Sleep(2 * SECONDS);

            Action action = new Action(MarshalToUI);
            this.Dispatcher.BeginInvoke(action);
        }

        private void MarshalToUI()
        {
            tbOutput.Text = "Task completed";
        }

    }
}

   
    
    
    
  








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