public HttpResponseBase ChangePayMent()
        {
            string json = string.Empty;
            OrderMasterQuery query = new OrderMasterQuery();
            try
            {
                if (!string.IsNullOrEmpty(Request.Params["payment"]))
                {
                    query.payment = Request.Params["payment"];
                }

                if (!string.IsNullOrEmpty(Request.Params["delivery"]))
                {
                    query.delivery = Convert.ToInt32(Request.Params["delivery"]);
                }
                if (!string.IsNullOrEmpty(Request.Params["order_id"]))
                {
                    query.Order_Id = Convert.ToUInt32(Request.Params["order_id"]);
                }
                if (!string.IsNullOrEmpty(Request.Params["delivery_store"]))
                {
                    query.Delivery_Store = Convert.ToUInt32(Request.Params["delivery_store"]);
                }
                System.Net.IPAddress[] addlist = Dns.GetHostByName(Dns.GetHostName()).AddressList;
                query.Order_Ipfrom = addlist[0].ToString();
               query.username = (Session["caller"] as Caller).user_username;
                _orderMasterMgr = new OrderMasterMgr(mySqlConnectionString);
                 json=   _orderMasterMgr.ChangePayMent(query);
            }
            catch (Exception ex)
            {
                Log4NetCustom.LogMessage logMessage = new Log4NetCustom.LogMessage();
                logMessage.Content = string.Format("TargetSite:{0},Source:{1},Message:{2}", ex.TargetSite.Name, ex.Source, ex.Message);
                logMessage.MethodName = System.Reflection.MethodBase.GetCurrentMethod().Name;
                log.Error(logMessage);
                json = "{success:false}";
            }
            this.Response.Clear();
            this.Response.Write(json);
            this.Response.End();
            return this.Response;
        }