How Can Use This Code In My text Box

public static string Convert(decimal number)
   {
       if (number == 0)
           return "ZERO";

       if (number < 0)
           return "MINUS " + Convert(Math.Abs(number));

       string words = String.Empty;

       long intPortion = (long)number;
       decimal fraction = (number - intPortion);
       int decimalPrecision = GetDecimalPrecision(number);

       fraction = CalculateFraction(decimalPrecision, fraction);

       long decPortion = (long)fraction;

       words = IntToWords(intPortion);
       if (decPortion > 0)
       {
           words += " POINT ";
           words += IntToWords(decPortion);
       }

       return words.Trim();
   }

   public static string IntToWords(long number)
   {
       if (number == 0)
           return "ZERO";

       if (number < 0)
           return "MINUS " + IntToWords(Math.Abs(number));

       string words = "";

       if ((number / 1000000000000000) > 0)
       {
           words += IntToWords(number / 1000000000000000) + " QUADRILLION ";
           number %= 1000000000000000;
       }

       if ((number / 1000000000000) > 0)
       {
           words += IntToWords(number / 1000000000000) + " TRILLION ";
           number %= 1000000000000;
       }

       if ((number / 1000000000) > 0)
       {
           words += IntToWords(number / 1000000000) + " BILLION ";
           number %= 1000000000;
       }

       if ((number / 1000000) > 0)
       {
           words += IntToWords(number / 1000000) + " MILLION ";
           number %= 1000000;
       }

       if ((number / 1000) > 0)
       {
           words += IntToWords(number / 1000) + " THOUSAND ";
           number %= 1000;
       }

       if ((number / 100) > 0)
       {
           words += IntToWords(number / 100) + " HUNDRED ";
           number %= 100;
       }

       if (number > 0)
       {
           if (words != String.Empty)
               words += "AND ";

           var unitsMap = new[] { "ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN", "TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN" };
           var tensMap = new[] { "ZERO", "TEN", "TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY" };

           if (number < 20)
               words += unitsMap[number];
           else
           {
               words += tensMap[number / 10];
               if ((number % 10) > 0)
                   words += "-" + unitsMap[number % 10];
           }
       }

       return words.Trim();
   }

   private static int GetDecimalPrecision(decimal number)
   {
       return (Decimal.GetBits(number)[3] >> 16) & 0x000000FF;
   }

   private static decimal CalculateFraction(int decimalPrecision, decimal fraction)
   {
       switch(decimalPrecision)
       {
           case 1:
               return fraction * 10;
           case 2:
               return fraction * 100;
           case 3:
               return fraction * 1000;
           case 4:
               return fraction * 10000;
           case 5:
               return fraction * 100000;
           case 6:
               return fraction * 1000000;
           case 7:
               return fraction * 10000000;
           case 8:
               return fraction * 100000000;
           case 9:
               return fraction * 1000000000;
           case 10:
               return fraction * 10000000000;
           case 11:
               return fraction * 100000000000;
           case 12:
               return fraction * 1000000000000;
           case 13:
               return fraction * 10000000000000;
           default:
               return fraction * 10000000000000;
       }
   }