public class DemoEnumerator {
public static void DemoCountdown() {
Countdown countdown = new Countdown();
countdown.StartCountdown = 5;

IEnumerator i = countdown.GetEnumerator();

while (i.MoveNext()) {
int n = (int) i.Current;
Console.WriteLine( n );
}
i.Reset(); // NESPRVN POUIT  VIZ VKLAD V KNIZE
while (i.MoveNext()) {
int n = (int) i.Current;
Console.WriteLine( "{0} BIS", n );
}
}
// . . .
}
