public static void Main2()
{
Point p = new Point(1, 1);
Console.WriteLine(p);
p.Change(2, 2);
Console.WriteLine(p);
Object o = p;
Console.WriteLine(o);
((Point)o).Change(3, 3);
Console.WriteLine(o);
// Boxes p, changes the boxed object and discards it
((IChangeBoxedPoint)p).Change(4, 4);
Console.WriteLine(p);
// Changes the boxed object and shows it
((IChangeBoxedPoint)o).Change(5, 5);
Console.WriteLine(o);
}
}