using System;

public class Program

{

    private static String[] units = { "Zero", "One", "Two", "Three",  

    "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven",  

    "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen",  

    "Seventeen", "Eighteen", "Nineteen" };  

    private static String[] tens = { "", "", "Twenty", "Thirty", "Forty",  

    "Fifty", "Sixty", "Seventy", "Eighty", "Ninety" };  

    public static void Main()

    {

        try  

        {  

            Console.WriteLine("Enter a Number to convert to words");  

            string number = "1,24,367";  

            number = number.Replace(",", "");

            number = ConvertAmount(double.Parse(number));  

​

            Console.WriteLine("Number in words is \n{0}", number);  

        }  

        catch (Exception ex)  

        {  

            Console.WriteLine(ex.Message);  

        } 

    }

    public static string ConvertAmount(double amount)  

    {  

        try  

        {  

            Int64 amount_int = (Int64)amount;  

            Int64 amount_dec = (Int64)Math.Round((amount - (double)(amount_int)) * 100);  

            if (amount_dec == 0)  

            {  

                return Convert(amount_int) + " Only.";  

            }  

            else  

            {  

                return Convert(amount_int) + " Rupees and " + Convert(amount_dec) + " Paise Only.";  

            }  

        }  

        catch (Exception ex)  

        {  

            // TODO: handle exception  

        }  

        return "";  

    }  

    public static String Convert(Int64 i)  

    {  

        if (i < 20)  

        {  

            return units[i];  

        }  

        if (i < 100)  

        {  

            return tens[i / 10] + ((i % 10 > 0) ? " " + Convert(i % 10) : "");  

        }  

        if (i < 1000)  

        {  

            return units[i / 100] + " Hundred"  

                    + ((i % 100 > 0) ? " " + Convert(i % 100) : "");  

        }  

        if (i < 100000)  

        {           return Convert(i / 1000) + " Thousand"  

                    + ((i % 1000 > 0) ? " " + Convert(i % 1000) : "");  

        }  

        if (i < 10000000)  

        {  

            return Convert(i / 100000) + " Lakh"  

                    + ((i % 100000 > 0) ? " " + Convert(i % 100000) : "");  

        }  

        if (i < 1000000000)  

        {  

            return Convert(i / 10000000) + " Crore"  

                    + ((i % 10000000 > 0) ? " " + Convert(i % 10000000) : "");  

        }  

        return Convert(i / 1000000000) + " Arab"  

                + ((i % 1000000000 > 0) ? " " + Convert(i % 1000000000) : "");  

    }  

}