Get tất cả link từ một URL

List allUrls = new List();

            WebClient client = new WebClient();

            string content = client.DownloadString("http://code2code.info");

            string pattern = @"(?i)(?s)]+?href=""?(?[^""]+)""?>(?.+?)";

            MatchCollection result = Regex.Matches(content, pattern);

            foreach (Match match in result)

            {

                string url = match.Groups["url"].Value;

                if (url.IndexOf("http://") != -1)

                {

                    allUrls.Add(url);

                }

                Console.WriteLine(url);

            }

            Console.Read();

        }

    }

}