PrimeNumbers

This is one I've written a few times on here:

using System;

using System.Collections.Generic;

class Prime

{

static void Main()

{

Console.WriteLine("The prime numbers less than 10000 are :\n");

int count = 0; // print 12 per line say

for (int i = 2; i < 10000; i++)

{

if(IsPrime(i))

{

Console.Write("{0,5} ", i);

count++;

if (count == 12)

{

Console.WriteLine();

count = 0;

}

if (count > 0) Console.WriteLine();

Console.ReadKey();

}

static bool IsPrime(int i)

{

if (i < 2) return false;

for(int j = 2; j <= i/2 ; j++)

{

if (i % j == 0) return false;

}

return true;

}