Sieve of Eratosthenes

EratoSieve

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;

namespace EratosthenesPrimeSieve
{
    class Program
    {
        static int[] numbers = new int[100000000];                                            
        static int maxNumber;

        static void Main(string[] args)
        {
            Console.WriteLine("Please enter a max number ");
            maxNumber = int.Parse(Console.ReadLine());
            Stopwatch sw = new Stopwatch();

            sw.Start();
            for (int num = 2; num < maxNumber + 1; num++)
                numbers[num-2] = num;
            sw.Stop();
            Console.WriteLine("Array fill complete. Time elapsed :" + 
				(double)sw.ElapsedMilliseconds/1000);

            sw.Restart();
            for(int idx=0;idx<maxNumber-3;idx++)
            {
                int num=numbers[idx];
                if (num != 0)
                {
                    while (num+idx < maxNumber )
                    {
                        numbers[idx + num] = '\0';
                        num += numbers[idx];
                    }
                }
            }
            sw.Stop();
            Console.WriteLine("Removed all non primes from the array. Time elapsed :" + 
                        	(double)sw.ElapsedMilliseconds/1000 + "\n" +
                              "Press enter to display all the primes upto "+maxNumber );
                                    
            IEnumerable<int> result= numbers.Where(num =>  num != 0);
            Console.WriteLine("Primes found :" + result.Count());
            Console.ReadLine();
            Parallel.ForEach(result, p => Console.Write(p + ","));
           
            Console.ReadLine();

        }
    }
}