private void UpdateOccupant()
 {
     if (this.mode == Mode.Create)
     {
         var ocp = new Occupant()
         {
             AppartmentId = this.AppartmentId,
             BirthDate    = this.BirthDate,
             FirstName    = this.FirstName,
             LastName     = this.LastName,
             Gender       = this.SelectedGender,
             MiddleName   = this.MiddleName,
             Owner        = this.Owner
         };
         ocp.OccupantId = context.AddNewOccupant(AppartmentId, FirstName, LastName, MiddleName, SelectedGender, BirthDate, Owner);
         parentAppartmentViewModel.SelectedAppartment.Occupants.Add(ocp);
     }
     else
     {
         var ocp = parentAppartmentViewModel.SelectedAppartment.Occupants.FirstOrDefault(x => x.OccupantId == Id);
         context.UpdateOccupant(Id, AppartmentId, FirstName, LastName, MiddleName, SelectedGender, BirthDate, Owner);
         int i = parentAppartmentViewModel.SelectedAppartment.Occupants.IndexOf(ocp);
         parentAppartmentViewModel.SelectedAppartment.Occupants[i] = new Occupant()
         {
             AppartmentId = this.AppartmentId,
             BirthDate    = this.BirthDate,
             FirstName    = this.FirstName,
             LastName     = this.LastName,
             Gender       = this.SelectedGender,
             MiddleName   = this.MiddleName,
             Owner        = this.Owner,
             OccupantId   = Id
         };
     }
 }