DownloadStringCompletedEventArgs Class

    // Sample call : DownloadStringInBackground2 ("http://www.contoso.com/GameScores.html");
    public static void DownloadStringInBackground2 (string address)
    {
        WebClient client = new WebClient ();
        Uri uri = new Uri(address);

        // Specify that the DownloadStringCallback2 method gets called
        // when the download completes.
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler (DownloadStringCallback2);
        client.DownloadStringAsync (uri);
    }

    private static void DownloadStringCallback2 (Object sender, DownloadStringCompletedEventArgs e)
    {
        // If the request was not canceled and did not throw
        // an exception, display the resource.
        if (!e.Cancelled && e.Error == null)
        {
            string textString = (string)e.Result;

            Console.WriteLine (textString);
        }
    }