读取网页Reponse数据，下面是一个浪驰短信的实例

public static string HttpSMSPost(HttpWebRequest hr, string url, string parameters)         {            string strRet = null;            ASCIIEncoding encoding = new ASCIIEncoding();             byte[] data = encoding.GetBytes(parameters);             try            {                hr.KeepAlive = false;                hr.Method = "POST";                hr.ContentType = "application/x-www-form-urlencoded";                hr.ContentLength = data.Length;                 Stream newStream = hr.GetRequestStream();                newStream.Write(data, 0, data.Length);                newStream.Close();                HttpWebResponse myResponse = (HttpWebResponse)hr.GetResponse();                    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default);                strRet = reader.ReadToEnd();                      reader.Close();                myResponse.Close();                return strRet;                    }            catch (Exception ex)            {                strRet = "-200";            }            return strRet;        }

使用：

string url = ;        string SMSparameters = "UserID=" + Userid + "&Account=" + Account + "&Password=" + PassWord;        string targeturl = url.Trim().ToString();        HttpWebRequest hr = (HttpWebRequest)WebRequest.Create(targeturl);        hr.CookieContainer = cookieContainerSMS;        string res = httpPost.HttpSMSPost(hr, url, SMSparameters);        XmlDocument xml = new XmlDocument();        xml.LoadXml(res);        string errorNum = xml.SelectSingleNode("/LANZ_ROOT/ErrorNum").InnerText;  //获取是否登陆成功        ActiveID = xml.SelectSingleNode("/LANZ_ROOT/ActiveID").InnerText;  //获取成功后的ActiveID         if (errorNum == "0")        {            //this.Close();            Response.Write("登陆成功");        }        else        {            Response.Write("");            //this.Close();        }