Why doesnt this method call work?

Question

Hi

I have the following code example:-

class Program
    {
        static void Sum(params int[] ints)
        {
            int sum = 0;

            for (int i = 0; i < ints.Length; i++)
            {
                sum += ints[i];
            }
        }
   
        static void Main()
        {
            int[] ints = { 1, 2, 3, 4 };

            Sum(ints);

            Console.WriteLine(ints);
            Console.ReadLine();
        }
   
    }

I was expecting the calling method "Main" to reflect the changes in the called method "Sum" as the array of ints is passed by reference?

Regards

Steven