Modifying refe and value types

using System;

namespace ModifyingOfRefAndValueTypes
{
    class Program
    {
        static void Main(string[] args)
        {

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

            int value = 6;

            //Array and value before modification
            Console.Write("array before modification: ");
            PrintArray(array);

            Console.Write("value before modification: ");
            Console.WriteLine(value);

            ModifyArray(array);
            ModifyValue(value);

            Console.Write("array after modification: ");
            PrintArray(array);

            Console.Write("value after modification: ");
            Console.WriteLine(value);


        }

        private static void ModifyValue(int value)
        {
            value += 45;
        }

        private static void ModifyArray(int[] array)
        {
            array[0] = +45;
        }

        private static void PrintArray(int[] array)
        {
            foreach (var item in array)
            {
                Console.Write(item + " ");

            }
            Console.WriteLine();
        }
    }
}