using System;
using System.Threading.Tasks;
using System.Timers;

namespace ConsoleApplication1
{
    internal class Program
    {
        public static async Task Main(string[] args)
        {
            Console.WriteLine("Before await");
            await SomeAsyncCode();
            Console.WriteLine("After await");
        }

        public static Task SomeAsyncCode()
        {
            var tcs = new TaskCompletionSource<bool>();
            var timer = new Timer();

            timer.Interval = 5000;
            timer.Elapsed += (sender, args) => tcs.SetResult(true);
            timer.Enabled = true;

            return tcs.Task;
        }
    }
}