using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public class Baa

    {

        public int Id { get; set; } = 2;

    }

    public class Foo

    {

        private IEnumerable<int> _ids;

        public IEnumerable<int> Ids => _ids ?? Enumerable.Empty<int>();

    }

    public static void Main()

    {

        Console.WriteLine("Hello World : " + DateTime.UtcNow);

        Console.WriteLine("---------------");

        var aaa = new List<Baa>();

        var asdasdsa = aaa.FirstOrDefault();

        Console.WriteLine(asdasdsa?.Id.ToString() ?? "aaaaaa");

        var ts = TimeSpan.Parse("00:30:00");

        Console.WriteLine(ts);

        Console.WriteLine(ts.Milliseconds);

        Console.WriteLine(ts.Seconds);

        Console.WriteLine(ts.Minutes);

        Console.WriteLine(ts.Hours);

    }

}