using System;

using System.Threading.Tasks;

using System.Threading;

public class Program

{

    public static  void Main()

    {t();

     System.Threading.Thread.Sleep(4000);

        }

    public static async Task t(){

        Console.WriteLine("Before test "+Thread.CurrentThread.ManagedThreadId);

    await test();

        //await test().ConfigureAwait(true);

        //test();

        Console.WriteLine("after test "+ Thread.CurrentThread.ManagedThreadId +" "+DateTime.Now);

    //System.Threading.Thread.Sleep(1500);

    Console.WriteLine("end :"+DateTime.Now);

    }

    public static async Task test()

    {

        Console.WriteLine("before task "+Thread.CurrentThread.ManagedThreadId+" "+DateTime.Now);

        await Task.Delay(1000);

        Console.WriteLine("after task "+ Thread.CurrentThread.ManagedThreadId+" "+DateTime.Now);

    }

}