How to use an array with an explanation as well

This blog shows the code on how to use an array to loop through!!!

using System;

namespace Demo
{
    internal class Program
    {
        private static unsafe void Main()
        {
            Console.Write("Specify size of array? \n> ");
            string userInput = Console.ReadLine();
            uint size = uint.Parse(userInput);

            long* pArray = stackalloc long[(int) size];
            for (int i = 0; i < size; i++)
            {
                pArray[i] = i*i;
            }

            for (int i = 0; i < size; i++)
            {
                Console.WriteLine("Element {0} = {1}", i, *(pArray + i));
            }

            Console.ReadLine();
        }
    }
}