convert numbers less than 10 billion to words

I write a program in c# which convert number into word .this program work correct for me hope it will help you:

Code is:







using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;
namespace ConsoleApplication1
{

    class Program
    {
        void Convert(long num, string str)
        {
            string[] st ={" "," one"," two"," three"," four"," five"," six"," seven"," eight"," nine", " ten",
                             " eleven"," twelve"," thirteen"," fourteen"," fifteen"," sixteen"," seventeen"," eighteen"," ninteen"};

            string[] st2 ={" "," "," twenty"," thirty"," fourty"," fifty"," sixty",
                         " seventy"," eighty"," ninty"};

            if (num > 19)
                Console.Write(" {0} {1} ", st2[num / 10], st[num % 10]);
            else
                Console.Write("{0} ", st[num]);

            if (num != 0)
                Console.Write("{0} ", str);



        }


        static void Main(string[] args)
        {
            long n;
            Program pg = new Program();
            Console.WriteLine("Enter Your Number ");
            n = long.Parse(Console.ReadLine());
            if (n < 0)
                Console.WriteLine("Number Should be greater then 0");
            else
            {
               pg.Convert((n / 10000000), "crore");
                pg.Convert(((n / 100000) % 100), "lakh");
                pg.Convert(((n / 1000) % 100), "thousand");
                pg.Convert(((n / 100) % 10), "hundred");
                pg.Convert((n % 100), " ");
            }

            Console.ReadKey();
        }
    }
}