public static string PostData(string p_strUrl, string p_strData)

        {

            Encoding dataEncode;

            dataEncode = System.Text.Encoding.UTF8;

            byte[] byteArray = dataEncode.GetBytes(p_strData); //转化

            HttpWebRequest http = (HttpWebRequest)WebRequest.Create(p_strUrl);

            http.Method = "POST";

            http.ContentType = "application/x-www-form-urlencoded";

            http.ContentLength = byteArray.Length;

            Stream newStream = http.GetRequestStream();

            newStream.Write(byteArray, 0, byteArray.Length);//写入参数

            newStream.Close();

            HttpWebResponse response = (HttpWebResponse)http.GetResponse();

            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

            string strRec = sr.ReadToEnd();

            sr.Close();

            response.Close();

            return strRec;

        }