Modify array in C#

using System;

namespace MyProject
{
    public class Program
    {
        static void MultiplyBy2(int[] arr) {
            for(int i = 0; i < arr.Length; ++i)
            {
                arr[i] *=2 ;
            }
        }
        public static void Main()
        {
            int[] arr = new int[]{1, 2, 3, 4, 5};
            MultiplyBy2(arr);
            for(int i = 0; i < arr.Length; ++i)
            {
                Console.WriteLine(arr[i]);
            }
        }
    }
}