用HTTP協議傳送、接收資料：

傳送：

    /// <summary>
        /// post給定的url並獲取返回的資料
        /// </summary>
        /// <param name="url"></param>
        /// <param name="timeout"></param>
        /// <returns></returns>
        private string GetPostResult(string url, string strXml, int timeout)
        {
            string result;
            try
            {
                strXml = strXml.Remove(0, strXml.IndexOf("<"));
                //將資料以資料流方式提交到閘道器
                WebRequest myWebRequest = WebRequest.Create(url);
                myWebRequest.Method = "POST";
                myWebRequest.Timeout = timeout;
                //myWebRequest.ContentType = "application/x-www-form-urlencoded";

                byte[] data = Encoding.Unicode.GetBytes(strXml);
                myWebRequest.ContentLength = data.Length;
                //新增Request.ContentType,否則對方可能無法接收
                myWebRequest.ContentType = "text/xml";
                myWebRequest.GetRequestStream().Write(data, 0, data.Length);

                HttpWebResponse rep2 = (HttpWebResponse)myWebRequest.GetResponse();

                //獲取返回的資料
                //WebResponse myWebResponse = myWebRequest.GetResponse();
                StreamReader sr = new StreamReader(rep2.GetResponseStream());
                result = sr.ReadToEnd();
                result = result.Replace("/r/n", "");
                sr.Close();
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.Print(e.ToString());
                result = "error";
            }
            return result;
        }

接收：

    XmlDocument xmlDoc = new System.Xml.XmlDocument();
                byte[] data = new byte[Request.InputStream.Length];
                Request.InputStream.Read(data, 0, (int)Request.InputStream.Length);

string orderXml = Encoding.Unicode.GetString(data);
                    Request.InputStream.Close();
                    orderXml = Server.HtmlDecode(orderXml);
                    xmlDoc.LoadXml(orderXml);