static void main(){
        CancellationTokenSource src = new CancellationTokenSource();
        Task.Run(() => { test(src.Token);});
        Console.ReadLine();
        src.Cancel();
        Console.ReadLine();
}

private async static void test(CancellationToken token) {
   while (!token.IsCancellationRequested) {
     Console.WriteLine("task:{0} scheduler:{1} thread:{2}", Task.CurrentId, TaskScheduler.Current.Id, Thread.CurrentThread.ManagedThreadId);
     await Task.Delay(2000);
   }
}