Converting numbers to the word equivalent.

        public static string ConvertToWords(int number)
            {
            switch (number)
                {
                case 0:
                    return "Zero";
                case 1:
                    return "One";
                ...
                case 568:
                    return "Five hundred and sixty-eight";
                case 569:
                    return "Five hundred and sixty-nine";
                }
            throw new ArgumentOutOfRangeException("Number greater than infinity!");
            }