using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        Task t1 = new Task(DoOnFirst);

        Task t2 = t1.ContinueWith(DoOnSecond);

        Task t3 = t1.ContinueWith(DoOnSecond);

        Task t4 = t2.ContinueWith(DoOnSecond);

        Task t5 = t1.ContinueWith(DoOnError, TaskContinuationOptions.OnlyOnFaulted);

        t1.Start();

        Thread.Sleep(5000);

        Console.ReadLine();

    }

    static void DoOnFirst()

    {

        Console.WriteLine("DoOnFirst doing some task {0}", Task.CurrentId);

        Thread.Sleep(3000);

    }

    static void DoOnSecond(Task t)

    {

        Console.WriteLine("DoOnSecond task {0} finished", t.Id);

        Console.WriteLine("DoOnSecond this task id {0}", Task.CurrentId);

        Console.WriteLine("DoOnSecond do some cleanup");

        Thread.Sleep(3000);

    }

    static void DoOnError(Task t)

    {

        Console.WriteLine("DoOnError task {0} had an error!", t.Id);

        Console.WriteLine("DoOnError my id {0}", Task.CurrentId);

        Console.WriteLine("DoOnError do some cleanup");

    }

}