gistfile1.cs

public async Task<IEnumerable<string>> GetLinksFromMsdnAsync()
{
    var response = await new WebClient().
		DownloadStringTaskAsync("http://msdn.microsoft.com/pt-br/");
    var regex = "href\\s*=\\s*(?:\"(?<1>[^\"]*)\"|(?<1>\\S+))";
    return Regex.Matches(response, regex)
            .OfType<Match>()
            .Select(m => m.Groups[1].Value);
}

public async void PrintLinksFromMSDNAsync()
{
    var links = await GetLinksFromMsdnAsync();
    foreach (var link in links)
        Console.WriteLine(link);
}