public List <Arrangement> SearchHotels(String criteria)
{
List <Arrangement> arrangements = new List <Arrangement>();
List <ObjectId> hotelsids = hotelRepository.GetHotelIds(criteria);
foreach (ObjectId id in hotelsids)
{
arrangements.AddRange(arrangementRepository.GetArrangementsByHotelId(id));
}
return(arrangements != null? arrangements : new List <Arrangement>());
}