using System;

using System.Threading;

using System.Threading.Tasks;

​

public static class Program

{

    public static void Main()

    {

        var tokenSource = new CancellationTokenSource();

        var task = Task.Delay(5000, tokenSource.Token);

        _ = task.ContinueWith(_ => Thread.Sleep(1000), default,

            TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);

        Console.WriteLine($"Before Cancel: {DateTime.Now.TimeOfDay}");

        tokenSource.Cancel();

        Console.WriteLine($"After Cancel:  {DateTime.Now.TimeOfDay}");

    }

}