Formatowanie double

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Double value = 14231891.32111;
            Console.WriteLine(String.Format("{0}", value));
            Console.WriteLine(String.Format("{0:00}", value));
            Console.WriteLine(String.Format("{0:n0}", value));
            Console.ReadLine();
        }
    }
}

wynik:

14231891,32111
14231891
14 231 891