AsynchronousLambda.Correct.Main.cs

using System;
using System.Threading.Tasks;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Foo().Wait();

            Console.WriteLine("Press ENTER...");
            Console.ReadLine();
        }

        private static async Task Foo()
        {
            await Task.Run(
                async () =>
                {
                    await Task.Delay(500);
                }
            );   
        }
    }
}