Convert the price digits to alphabetic format

AmountInWords obj=new AmountInWords();
textbox2.Text=obj.ConvertAmount(Convert.ToDouble(textBox1.Text))

class AmountInWords
   {
       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 String ConvertAmount(double amount)
       {
           try
           {
               int amount_int = (int)amount;
               int amount_dec = (int)Math.Round((amount - (double)(amount_int)) * 100);
               return convert(amount_int) + "  point "
                       + convert(amount_dec);
           }
           catch (Exception e)
           {
               // TODO: handle exception
           }
           return "";
       }

       public String convert(int 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) ? " and " + 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) : "");
           return convert(i / 10000000) + " Crore "
                   + ((i % 10000000 > 0) ? " " + convert(i % 10000000) : "");
       }

   }