public string ApproveDoctor(string callType, string xmlMessage)
        {
            string result = "", id = "";

            string logID = Guid.NewGuid().ToString();

            try
            {
                FileLogger.WriteLog(logID + "|Start:" + xmlMessage, 1, "", callType);

                if (Helper.CheckAuthCode(callType, xmlMessage))
                {
                    Doctor h = new Doctor();
                    id = h.Approve(xmlMessage);
                    if (id != "-1")
                    {
                        result = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
                                 "<" + callType + ">" +
                                 "<Result>True</Result>" +
                                 "<ID>" + id + "</ID>" +
                                 "<Description></Description></" + callType + ">";
                    }
                    else
                    {
                        result = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
                                 "<" + callType + ">" +
                                 "<Result>False</Result>" +
                                 "<Description></Description></" + callType + ">";
                    }
                }
            }
            catch (Exception err)
            {
                result = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
                         "<" + callType + ">" +
                         "<Result>False</Result>" +
                         "<Description>" + err.Message + "</Description></" + callType + ">";
            }
            FileLogger.WriteLog(logID + "|End:" + result, 1, "", callType);
            return(result);
        }