c# 带参数post

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private string PostWebRequest(string postUrl, string paramData, string referString)
        {
            string ret = string.Empty;
            try
            {
                if (!postUrl.StartsWith("http://"))
                    return "";

                byte[] byteArray = Encoding.Default.GetBytes(paramData); //转化 /
                HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
                webReq.Method = "POST";
                webReq.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
              // webReq.Referer = "";
                webReq.Referer = referString;
                // webReq.ContentLength = byteArray.Length;
                Stream newStream = webReq.GetRequestStream();
                newStream.Write(byteArray, 0, byteArray.Length);//写入参数
                newStream.Close();
                HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();
                StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                ret = sr.ReadToEnd();
                sr.Close();
                response.Close();
                newStream.Close();
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            return ret;
        }

            string url = ""; //post地址

            string parm = "ticketId=A7FB4149-F15C-469D-81E2-C5277E15C9CD";//注意格式

            PostWebRequest(url,parm);