Here, I have described how to convert numeric values to words - not only whole numbers but also, the numbers with decimal values. For example,
562.53 = Five Hundred And Sixty Two Point Fifty Three Only.
The function is named "ConvertAmount" and accepts a parameter of type double. First, the function checks the existence of decimal in the number passed as a parameter.

If decimal exists, it constructs the word for point value. After removing the decimal digits from the number, it converts digits, tens, and hundreds by using the function "Convert" and returns a string containing the number in words.
  1. class NumberToWords
  2. {
  3. private static String[] units = { "Zero", "One", "Two", "Three",
  4. "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven",
  5. "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen",
  6. "Seventeen", "Eighteen", "Nineteen" };
  7. private static String[] tens = { "", "", "Twenty", "Thirty", "Forty",
  8. "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" };
  10. public static String ConvertAmount(double amount)
  11. {
  12. try
  13. {
  14. Int64 amount_int = (Int64)amount;
  15. Int64 amount_dec = (Int64)Math.Round((amount - (double)(amount_int)) * 100);
  16. if (amount_dec == 0)
  17. {
  18. return Convert(amount_int) + " Only.";
  19. }
  20. else
  21. {
  22. return Convert(amount_int) + " Point " + Convert(amount_dec) + " Only.";
  23. }
  24. }
  25. catch (Exception e)
  26. {
  27. // TODO: handle exception
  28. }
  29. return "";
  30. }
  32. public static String Convert(Int64 i)
  33. {
  34. if (i < 20)
  35. {
  36. return units[i];
  37. }
  38. if (i < 100)
  39. {
  40. return tens[i / 10] + ((i % 10 > 0) ? " " + Convert(i % 10) : "");
  41. }
  42. if (i < 1000)
  43. {
  44. return units[i / 100] + " Hundred"
  45. + ((i % 100 > 0) ? " And " + Convert(i % 100) : "");
  46. }
  47. if (i < 100000)
  48. { return Convert(i / 1000) + " Thousand "
  49. + ((i % 1000 > 0) ? " " + Convert(i % 1000) : "");
  50. }
  51. if (i < 10000000)
  52. {
  53. return Convert(i / 100000) + " Lakh "
  54. + ((i % 100000 > 0) ? " " + Convert(i % 100000) : "");
  55. }
  56. if (i < 1000000000)
  57. {
  58. return Convert(i / 10000000) + " Crore "
  59. + ((i % 10000000 > 0) ? " " + Convert(i % 10000000) : "");
  60. }
  61. return Convert(i / 1000000000) + " Arab "
  62. + ((i % 1000000000 > 0) ? " " + Convert(i % 1000000000) : "");
  63. }
  64. }
Now, call the ConvertAmount method.
  1. static void Main(string[] args)
  2. {
  3. try
  4. {
  5. Console.WriteLine("Enter a Number to convert to words");
  6. string number = Console.ReadLine();
  7. number = ConvertAmount(double.Parse(number));
  9. Console.WriteLine("Number in words is \n{0}", number);
  10. Console.ReadKey();
  11. }
  12. catch (Exception ex)
  13. {
  14. Console.WriteLine(ex.Message);
  15. }
  16. }
I hope this is useful for all readers. Happy Coding!