using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var test = new Test();

        Console.WriteLine(!test.Coll?.Any() ?? false);

        Console.WriteLine(!test.Coll?.Any() ?? true);

        Console.WriteLine(test?.Test1());

        test.Coll = null;

        Console.WriteLine(!test.Coll?.Any() ?? false);

        Console.WriteLine(!test.Coll?.Any() ?? true);

        test = null;

        Console.WriteLine(test?.Test1());

    }

    public class Test

    {

        public List<int> Coll = new List<int>();

        public bool Test1() { return true; }

    }

}