public List<SalesDiscount> GetDiscounts() { return ItemPriceDemoData.GetDiscounts(); }
public SalesDiscount GetDiscount(int discountId) { return ItemPriceDemoData.GetDiscounts().SingleOrDefault(d => d.Id == discountId); }
public SalesItem GetSalesItem(int itemId) { return ItemPriceDemoData.GetSalesItems().SingleOrDefault(i => i.Id == itemId); }