using HtmlAgilityPack;

 static void Main(string[] args)
        {
            string html = GetHtml("http://www.phpstudy.net");
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(html);
            HtmlNode node = doc.DocumentNode;
            HtmlNode div = node.SelectNodes("//table[@class='dataintable']")[0];
            Console.WriteLine(div.InnerHtml);
            Console.Read();
        }

        static string GetHtml(string url)
        {

            WebRequest request = WebRequest.Create(url);
            WebResponse res = request.GetResponse();
            StreamReader sr = new StreamReader(res.GetResponseStream(), Encoding.UTF8);
            string html = sr.ReadToEnd();
            sr.Close();
            res.Close();
            return html;
        }