var result = DataSummaryRepository.FindBy(x => x.UserID == argMemberNo && x.SummaryDate <= argEndDate && x.SummaryDate >= argStarDate).OrderByDescending(x => x.SummaryDate).GroupBy(x => new { x.SummaryDate, x.UserID }).Select(g => new

            {

                PV = g.Sum(x => x.PV),

                UV = g.Sum(x => x.UV),

                OrderQunantity = g.Sum(x => x.OrderQunantity),

                OrderAmount = g.Sum(x => x.OrderAmount),

                CommissionEstimate = g.Sum(x => x.CommissionEstimate),

                AvaliableCommission = g.Sum(x => x.AvaliableCommission),

                HistoryCommission = g.Sum(x => x.HistoryCommission),

                SummaryDate = g.Key.SummaryDate,

                UserID = g.Key.UserID

            });