using System;
using System.Diagnostics;
using System.Threading.Tasks;

namespace Samples
{
    class MessagePrinterSample
    {
        private delegate Task MessagePrinter(string message);

        private static async Task PrintMessageAsync(string message)
        {
            await Task.Delay(1000);
            Console.WriteLine(message);
        }

        public static void Sample()
        {
            MessagePrinter printer = PrintMessageAsync;
            Console.WriteLine("Start...");
            
            printer("This is first message");
            printer("This is second message");
            printer("This is third message");
            
            Console.WriteLine("Finish...");
        }
    }
}