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;
}