using System;

using System.Threading.Tasks;

​

namespace Brad

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var task = new Program().Start();

            Console.WriteLine("Wait...");

            // You have to put a synchronous Wait() here because

            // Main cannot be declared as async

            task.Wait();

        }

​

        public async Task Start()

        {

            var task1 =  GetNumber();

            var task2 =  GetNumber();

            var task3 =  GetNumber();

            // This runs the tasks in parallel

            await Task.WhenAll(new []{task1,task2,task3});

            Console.WriteLine("Finished");

        }

​

        public static async Task<int> GetNumber()

        {

            await Task.Delay(TimeSpan.FromMilliseconds(400));

            Console.WriteLine("Hello");

            return 0;

        }

    }

}