using System;

using System.Threading.Tasks;

public class Program

{

    public static async void Main()

    {

        Console.WriteLine("start1");

        await Task.Run(() => Test());

        Console.WriteLine("end1");

        Console.WriteLine("start2");

        await Task.Run(async () => await Test());

        Console.WriteLine("end2");

    }

    // Define other methods and classes here

    private async static Task Test(){

        Console.WriteLine("test start");

        await Task.Delay(1000);

        Console.WriteLine("test end");

    }

​

}