using System;

using System.Diagnostics;

using System.Text;

using System.IO;

using System.Globalization;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<string>? list = null;

        Console.WriteLine("List<string>? list = null;\n");

        Console.WriteLine($"  1) !list?.Any() == null?  {!list?.Any() == null}");

        Console.WriteLine();

        Console.WriteLine($"  2) !list?.Any() == false?  {!list?.Any() == false}");

        Console.WriteLine();

        Console.WriteLine($"  3) !list?.Any() == true?  {!list?.Any() == true}");

        Console.WriteLine();

        Console.WriteLine($"  4) list == null || !list.Any()?  {list == null || !list.Any()}");

        list = new List<string>();

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

        Console.WriteLine("list = new List<string>();\n");

        Console.WriteLine($"1) !list?.Any() == null?  {!list?.Any() == null}");

        Console.WriteLine();

        Console.WriteLine($"2) !list?.Any() == false?  {!list?.Any() == false}");

        Console.WriteLine();

        Console.WriteLine($"3) !list?.Any() == true?  {!list?.Any() == true}");

        Console.WriteLine();

        Console.WriteLine($"4) list == null || !list.Any()?  {list == null || !list.Any()}");

        list = new List<string>{ "I Have a value" };

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

        Console.WriteLine("list = new List<string>{ \"I Have a value\" };\n");

        Console.WriteLine($"1) !list?.Any() == null?  {!list?.Any() == null}");

        Console.WriteLine();

        Console.WriteLine($"2) !list?.Any() == false?  {!list?.Any() == false}");

        Console.WriteLine();

        Console.WriteLine($"3) !list?.Any() == true?  {!list?.Any() == true}");

        Console.WriteLine();

        Console.WriteLine($"4) list == null || !list.Any()?  {list == null || !list.Any()}");

    }

}