/// <summary>
/// the reservation can be comapred with another reservation or with integer
/// </summary>
public int CompareTo(object obj)
{
if (obj is Reservation)
{
return(ReservationID.CompareTo(((Reservation)(obj)).ReservationID));
}
else if (obj is int)
{
return(ReservationID.CompareTo(obj));
}
else
{
throw new ArgumentException("obj must be \"Reservation\" or int.");
}
}
