Function swap reference parameters Learn programming C#

using System;
public class exercise106
{
    public static void Swap(ref int x, ref int y)
    {
        int swap;

        swap = x;
        x = y;
        y = swap;
    }

    public static void Main()
    {
        int x = 5;
        int y = 3;

        Swap(ref x, ref y);

        Console.WriteLine("x: {0} , y: {1}", x, y);
    }
}