using System;

using System.Linq;

using System.Threading;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        _bigList = new Lazy<List<int>>( () => {

            var list = new List<int>();

            for(var i = 0; i < 30; i ++)

            {

                list.Add(i);

                Thread.Sleep(100);

            }

            return list;

        });

        Console.WriteLine(BigList.Any());

        Console.WriteLine(BigList.Count);

    }

    public static List<int> BigList => _bigList.Value;

    private static Lazy<List<int>> _bigList;

}