using System;

using System.Collections.Generic;

using System.Threading.Tasks;

public class Program

{

    public async static Task Main()

    {

            var tasks = new List<Task>();

            var arr = new  [] {10, 100, 650, 25, 5, 50};

            foreach(var i in arr) {

                tasks.Add(Task.Delay(i).ContinueWith(task => Console.WriteLine(i)));

            }

​

            await Task.WhenAll(tasks);

    }

}