public int add(Resident newResident)
{
int counter = residents.Count;
residents.Add(newResident);
if (residents.Count % 3 == 0) newResidents(3);
return (residents.Count == counter + 1) ? newResident.ClientID : -1;
}
private void newResidents(int num)
{
if (NewResidents == null || num <= 0) return;
Resident[] theNewResidents = new Resident[num];
while (--num >= 0) theNewResidents[num] = residents[residents.Count - num - 1];
NewResidents(this, new EventArgs<Resident[]>(theNewResidents));
}