using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

  public static void Main()

  {

      FuncA();

      Thread.Sleep(500);

      Console.WriteLine(Environment.NewLine + System.DateTime.Now);

  }

​

  private static void FuncA()

{

    Console.WriteLine("A First!");

    FuncB();

    Console.WriteLine("A Last!");

}

private static async void FuncB()

{

    Console.WriteLine("B First!");

    await FuncC();

    FuncD();

    Console.WriteLine("B Last!");

}

private static async Task FuncC()

{

    Console.WriteLine("C First!");

    // Wait 200 mseconds

    await Task.Delay(200);

    Console.WriteLine("C Last!");

}

private static void FuncD()

{

    Console.WriteLine("D!");

}

}