public class GetHtml

    {

        public string GetWebRequest(string url)

        {

            Uri uri = new Uri(url);

            WebRequest myReq = WebRequest.Create(uri);

            WebResponse result = myReq.GetResponse();

            Stream receviceStream = result.GetResponseStream();

            StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));

            string strHTML = readerOfStream.ReadToEnd();

            readerOfStream.Close();

            receviceStream.Close();

            result.Close();

            return strHTML;

        }

        public string GetWebClient(string url)

        {

            string strHTML = "";

            WebClient myWebClient = new WebClient();

            Stream myStream = myWebClient.OpenRead(url);

            StreamReader sr = new StreamReader(myStream, System.Text.Encoding.GetEncoding("utf-8"));

            strHTML = sr.ReadToEnd();

            myStream.Close();

            return strHTML;

        }

        public string GetHttpWebRequest(string url)

        {

            Uri uri = new Uri(url);

            HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(uri);

            myReq.UserAgent = "User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705";

            myReq.Accept = "*/*";

            myReq.KeepAlive = true;

            myReq.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");

            HttpWebResponse result = (HttpWebResponse)myReq.GetResponse();

            Stream receviceStream = result.GetResponseStream();

            StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));

            string strHTML = readerOfStream.ReadToEnd();

            readerOfStream.Close();

            receviceStream.Close();

            result.Close();

            return strHTML;

        }

    }