using System;

using System.Collections.Generic;

public class Program

{

    public static List<int> intList = new List<int> {1, 2, 3, 4};

    public static void Main()

    {

        Console.WriteLine("Before: ");

        Print();

        Console.WriteLine("AddRange(emptyList): ");

        var emptyList = new List<int>();

        intList.AddRange(emptyList);

        Print();

    }

    public static void Print() {

        foreach (var x in intList)

        {

            Console.WriteLine($@" {x}");

        }

        Console.WriteLine("");

    }

}