using System;

​

public class Program

{

    public static void Main()

    {

        int[] numbers = new int[]{10, 20, 30, 40};

        Console.WriteLine("--- Change reference/pointer/memory location");

        Console.WriteLine($"Original: {string.Join(", ", numbers)}");

        ChangeReference(numbers);

        Console.WriteLine($"After: {string.Join(", ", numbers)}");

        Console.WriteLine();

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

        Console.WriteLine($"Original: {string.Join(", ", numbers)}");

        ChangeContent(numbers);

        Console.WriteLine($"After: {string.Join(", ", numbers)}");

    }

​

    static void ChangeReference(int[] nums)

    {

        nums = new int[]{1, 2, 3, 4, 5};

    }

​

    static void ChangeContent(int[] nums)

    {

        nums[0] = 1;

        nums[1] = 2;

    }

}