string paras = "loginName=admin";//参数            byte[] bytes = Encoding.UTF8.GetBytes(paras);            HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create("http://localhost:6666/WebService1.asmx/GetPerson");            //HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create("http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getRegionDataset");            httpRequest.UserAgent = "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT6.2; WOW64; Trident/6.0; Touch; ASU2JS)";            httpRequest.ContentLength = bytes.Length;             httpRequest.ContentType = "application/x-www-form-urlencoded";            httpRequest.Method = "Post";            using (Stream sm = httpRequest.GetRequestStream())            {                sm.Write(bytes, 0, bytes.Length);            }            HttpWebResponse respone = httpRequest.GetResponse() as HttpWebResponse;             using (Stream sr = respone.GetResponseStream())            {                using (StreamReader sr2 = new StreamReader(sr, Encoding.GetEncoding("UTF-8")))                {                    string xml = sr2.ReadToEnd();                    StringReader stream = null;                    XmlTextReader reader = null;                    DataSet xmlDS = new DataSet();                    stream = new StringReader(xml);                    //从stream装载到XmlTextReader                    reader = new XmlTextReader(stream);                    xmlDS.ReadXml(reader);                }            }