public JsonResult Get(int pageIndex, int pageSize, string pageOrder)
        {
            var list = PaymentMethods.Get(pageIndex, pageSize, pageOrder);

            int total     = PaymentMethods.Count();
            int totalPage = (int)Math.Ceiling((decimal)total / pageSize);

            if (pageSize > total)
            {
                pageSize = total;
            }

            if (list.Count < pageSize)
            {
                pageSize = list.Count;
            }

            JsonResult result = new JsonResult()
            {
                Data = new
                {
                    TotalPages = totalPage,
                    PageIndex  = pageIndex,
                    PageSize   = pageSize,
                    Rows       = list
                },
                JsonRequestBehavior = JsonRequestBehavior.AllowGet
            };

            return(result);
        }