using System;

using System.Threading;

using System.Threading.Tasks;

​

namespace AsyncAwait

{

    class Program

    {

        static async Task Main(string[] args)

        {

            Console.WriteLine("Create and don't await tasks");

            var t1 = Task1Async();

            var t2 = Task2Async();

            await Task.WhenAll(t1, t2);

​

            Console.WriteLine("Create and await tasks");

            await Task1Async();

            await Task2Async();

        }

​

        static async Task Task1Async()

        {

            Console.WriteLine($"1.1, {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine($"1.2, {Thread.CurrentThread.ManagedThreadId}");

            await Task.Delay(1000);

            Console.WriteLine($"1.3, {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine($"1.4, {Thread.CurrentThread.ManagedThreadId}");

​

        }

        static async Task Task2Async()

        {

            Console.WriteLine($"2.1, {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine($"2.2, {Thread.CurrentThread.ManagedThreadId}");

            await Task.Delay(1010);

            Console.WriteLine($"2.3, {Thread.CurrentThread.ManagedThreadId}");

            Console.WriteLine($"2.4, {Thread.CurrentThread.ManagedThreadId}");

​

        }

    }

}