Program.cs

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

namespace CSharpAsyncExample
{
    public class Kitchen
    {
        private static Stopwatch Stopwatch { get; set; }

        static void Main(string[] args)
        {
            Stopwatch = new Stopwatch();
            Stopwatch.Start();
            Console.WriteLine($"[Kitchen] Started making breakfast - Synchronous Chef");

            MakeBreakfastWithSynchronousChef();

            Console.WriteLine($"[Kitchen] Breakfast done in '{Stopwatch.Elapsed.Seconds}'s '{Stopwatch.Elapsed.Milliseconds}'ms");
            Stopwatch.Restart();

            Console.WriteLine("---");
            Console.WriteLine($"[Kitchen] Started making breakfast - Asynchronous Chef");

            MakeBreakfastWithAsynchronousChef().Wait();

            Console.WriteLine($"[Kitchen] Breakfast done in '{Stopwatch.Elapsed.Seconds}'s '{Stopwatch.Elapsed.Milliseconds}'ms");
        }

        static void MakeBreakfastWithSynchronousChef()
        {
            var chef = new SynchronousChef();
            chef.MakeBreakfast();
        }

        static async Task MakeBreakfastWithAsynchronousChef()
        {
            var chef = new AsynchronousChef();
            await chef.MakeBreakfast();
        }

        static async Task MakeBreakfastAndDisturbChef()
        {
            var chef = new AsynchronousChef();
            var breakfastTask = chef.MakeBreakfast();

            Task.Delay(1500).Wait();
            Console.WriteLine($"[Kitchen] a joke from chef: '{chef.TellAJoke().Result}'");

            Task.Delay(9000).Wait();
            chef.PourJuice().Wait();

            await breakfastTask;
        }
    }
}