gistfile1.cs

public void PrintLinksFromMSDN()
{
    var wc = new WebClient();
    var response = wc.DownloadString("http://msdn.microsoft.com/pt-br/");
    var regex = "href\\s*=\\s*(?:\"(?[^\"]*)\"|(?\\S+))";
    var matches =  Regex.Matches(response, regex);
            
    foreach (Match match in matches)
        Console.WriteLine(match.Groups[1]);
}