using System;

using System.Threading.Tasks;

#nullable enable

​

public class Program

{

    public static async Task Main()

    {

        for (int i = 1; i < 5; i++)

        {

            Console.WriteLine($"Looping through index {i} now...");

            DoWorkAsync($"Task {i}", i);

        }

        Console.WriteLine("Console app ended");

    }

    public static async Task DoWorkAsync(string nameOfTask, int secondsToDelay)

    {

        Console.WriteLine($"{nameOfTask} has started.");

        await Task.Delay(secondsToDelay * 1000);

        Console.WriteLine($"{nameOfTask} has finished.");

    }

}