public virtual List <dtBillingBasicForRentalList> GetBillingBasicForRentalList(string contractCode, string c_CURRENCY_LOCAL, string c_CURRENCY_US)
        {
            BLDataEntities context = new BLDataEntities();

            return(context.GetBillingBasicForRentalList(contractCode, c_CURRENCY_LOCAL, c_CURRENCY_US).ToList());
        }