Use Cancel button triggers the cancellation.

    
<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">
        <StackPanel Orientation="Vertical">
            <Button x:Name="myButton" Content="Request Content" Height="30" Width="120" Click="myButton_Click" />
            <TextBlock x:Name="myTextBlock" />
        </StackPanel>
    </Grid>
</UserControl>


//File: Page.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.Text;

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

        private void myButton_Click(object sender, RoutedEventArgs e)
        {
            RequestStreamContent();
        }

        public void RequestStreamContent()
        {
            Uri uri = new Uri("http://silverlightinaction.com/video3.wmv");        

            WebClient webClient = new WebClient();                        
            webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
            webClient.OpenReadAsync(uri);                                    
        }

        void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            StringBuilder sb = new StringBuilder();            
            sb.Append(e.BytesReceived + " of ");                                    
            sb.Append(e.TotalBytesToReceive + " bytes received");                  

            myTextBlock.Text = sb.ToString();
        }
    }
}

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Use Cancel button triggers the cancellation. : WebClient « Communication « Silverlight

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