gistfile1.cs

public void PrintLinksFromMSDNWithTasks()
{
    Task.Factory.StartNew(
        () => new WebClient().DownloadString("http://msdn.microsoft.com/pt-br/")
        ).ContinueWith(e =>
            {
                var regex = "href\\s*=\\s*(?:\"(?[^\"]*)\"|(?\\S+))";
                var matches = Regex.Matches(e.Result, regex);

                foreach (Match match in matches)
                    Console.WriteLine(match.Groups[1]);
            }
    );
}