Refactoring Code C#

using System;

namespace PrimeRefactoringCSharp
{
 
public class Primes
        {
        /** The default stopping point for primes */
        public static long DEFAULT_STOP =
            500L; // 4294967295L;
            /** The first prime number */
            public static  int FP = 2;

            static int MAX = 10000;

            static void Main(string[] args)
            {
                long[] prime = new long[MAX];

                long stop = DEFAULT_STOP;
                if (args.Length == 1)
                {
                    stop = long.Parse(args[0]);
                }

                prime[1] = FP;       // P1 (ignore prime[0])
                long n = FP + 1;       // odd candidates
                int j = 1;        // numberFound

                bool isPrime = true;  // for 3

                do
                {

                    if (isPrime)
                    {
                        if (j == MAX - 1)
                        {
                            // Grow array dynamically if needed
                            long[] np = new long[MAX * 2];
                            Array.Copy(prime, 0, np, 0, MAX);
                            MAX *= 2;
                            prime = np;
                        }
                        prime[++j] = n;  // P2
                        isPrime = false;
                    }
                    n += 2;        // P4

                    for (int k = 2; k <= j && k < MAX; k++)
                    {  // P5, P6, P8
                        long q = n / prime[k];
                        long r = n % prime[k];
                        if (r == 0)
                        {
                            break;
                        }
                        if (q <= prime[k])
                        {    // P7
                            isPrime = true;
                            break;
                        }
                    }

                } while (n < stop);        // P3

                for (int i = 1; i <= j; i++)
                    Console.WriteLine(prime[i]);
            }
        }


    }