Passing by reference in C#

using System.IO;
using System;

class Program
{
    static void Main()
    {
        
        int x = 5;
        int y = 10;
        
        
        //I promise, C# treats arrays like objects.
        int[] xObject = new int[1]; xObject[0] = 5;
        int[] yObject = new int[1]; yObject[0] = 10;
        
        
        
        playingWithRefs(ref x, ref y);
        Console.WriteLine(x); //10
        alsoAReferenceButReferenceMeansADifferentThingHere(xObject, yObject);
        Console.WriteLine(xObject[0]); //5
        passingObjectsByReferenceUsingRef(ref xObject, ref yObject);
        Console.WriteLine(xObject[0]); //10
    }
    
    //We specify to pass by reference wit the ref keyword.
    static void playingWithRefs(ref int a, ref int b)
    {
        a = b;
    }
    
    //We're passing by reference in the sense that we're passing in objects.
    static void alsoAReferenceButReferenceMeansADifferentThingHere(int[] a, int[] b)
    {
        a = b;
    }
    
    static void passingObjectsByReferenceUsingRef(ref int[] a, ref int[] b)
    {
        a = b;
    }
}