Convert BigInteger to string with number formatting information in CSharp

using System;/* w w w  .j  av  a 2 s . c o m*/
using System.Globalization;
using System.Numerics;

public class Example
{
    public static void Main()
    {
        BigInteger number = 999999999999999;
        number = BigInteger.Pow(number, 3) * BigInteger.MinusOne;

        NumberFormatInfo bigIntegerProvider = new NumberFormatInfo();
        bigIntegerProvider.NegativeSign = "~";

        Console.WriteLine(number.ToString(bigIntegerProvider));
    }
}