using System;
using System.Threading;
class MainClass
{
public static void Countdown(Object o)
{
for (int i = 1000; i > 0; i--)
{
Console.Write(i.ToString() + " ");
}
}
public static void Main()
{
ThreadPool.QueueUserWorkItem(new WaitCallback(Countdown), null);
}
}
1000 999 998 997 996 995 994 993 992 991 990 989 988