using System;

​

public class Program

{

    public static void Main()

    {

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

        int[] oldNumbers = numbers; // store a temporary reference to numbers

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

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

        ChangeReference(ref numbers);

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

        Console.WriteLine($"Still the same object? {numbers.Equals(oldNumbers)}");

        oldNumbers = numbers;

        Console.WriteLine();

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

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

        ChangeContent(ref numbers);

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

        Console.WriteLine($"Still the same object? {numbers.Equals(oldNumbers)}");

    }

​

    static void ChangeReference(ref int[] nums)

    {

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

    }

​

    static void ChangeContent(ref int[] nums)

    {

        nums[0] = 100;

        nums[1] = 200;

    }

}