using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using System.Linq;                  

public class Program

{

    static async Task Main(string[] args)

        {

            List<int> lst = null;

            DateTime StartTime = DateTime.Now;

            lst = await GetList();

            DateTime EndTime = DateTime.Now;

            Console.WriteLine("ran tasks in " + (EndTime - StartTime).TotalSeconds + " seconds");

            Console.WriteLine("Resulting list: " + String.Join(',', lst));

        }

​

​

        static async Task<List<int>> GetList()

        {

            var tasks = new List<Task<int>>();

            tasks.Add(Task1());

            tasks.Add(Task2());

​

            int[]  results = await Task.WhenAll(tasks);

​

            //return list

            return results.ToList();

        }

​

        static async Task<int> Task1()

        {

            await Task.Delay(1000);

            return 1;

        }

​

        static async Task<int> Task2()

        {

            await Task.Delay(1000);

            return 2;

        }

}