private void PrepareSummary()
        {
            var rentalItems = new List <RentalItemModel>();

            rentalItems.AddRange(SelectedProps);

            if (SelectedBooth != null)
            {
                rentalItems.Add(SelectedBooth);
            }
            if (SelectedBackground != null)
            {
                rentalItems.Add(SelectedBackground);
            }

            OrderPreview = _orderFacade.PrepareOrderAsync(rentalItems, Products.Where(t => SelectedProductIds.Contains(t.Id)).ToList(), OrderBasicInfo).Result;
        }