using System;

using System.Linq;

using System.Threading.Tasks;

using System.Threading;

​

public class Program

{

    public static async void Thread1()

    {

        for (int i = 0; i < 100; i++)

        {

            Console.WriteLine("Thread1 " + i);

            await MyFunc();

        }

    }

​

    public static async void Thread2()

    {

        for (int i = 0; i < 100; i++)

        {

            Console.WriteLine("Thread2 " + i);

            await MyFunc();

        }

    }

    public static async Task Task1()

    {

        for (int i = 0; i < 100; i++)

        {

            Console.WriteLine("Task1 " + i);

            await MyFunc();

        }

    }

    public static async Task Task2()

    {

        for (int i = 0; i < 100; i++)

        {

            Console.WriteLine("Task2 " + i);

            await MyFunc();

        }

    }

    public static async Task MyFunc()

    {

    }

​

    public static void TestWithThreads()

    {

        var thread1 = new Thread(Thread1);

        var thread2 = new Thread(Thread2);

        thread1.Start();

        thread2.Start();

        while (thread1.IsAlive || thread2.IsAlive)

        {

            Thread.Sleep(1000);

        }

    }

    public static void TestWithTasks()

    {

        Task.WaitAll

        ( 

            new[] 

            {

                Task1(), 

                Task2() 

            } 

        );

    }

    public static void Main()

    {

        TestWithThreads();

        TestWithTasks();        

    }

}