public void RemoveApartments(Apartment apr)
 {
     Apartments.Remove(apr);
 }
 public void AddOwnerToApar(string ownerId, Apartment apar)
 {
 }
 public void AddApartments(Apartment apr)
 {
     Apartments.Add(apr);
 }
 public void AddTypeToApar(int aparId, Apartment apar)
 {
 }