How to convert number into words in c# code.

 public string retWord(int number)
  {

      if (number == 0) return "Zero";
      if (number == -2147483648) return "Minus Two Hundred and Fourteen Crore Seventy Four Lakh Eighty Three Thousand Six Hundred and Forty Eight";
      int[] num = new int[4];
      int first = 0;
      int u, h, t;
      System.Text.StringBuilder sb = new System.Text.StringBuilder();

      if (number < 0)
      {
          sb.Append("Minus");
          number = -number;
      }
      string[] words0 = { "", "One ", "Two ", "Three ", "Four ", "Five ", "Six ", "Seven ", "Eight", "Nine " };
      string[] words = { "Ten ", "Eleven ", "Twelve ", "Thirteen ", "Fourteen ", "Fifteen ", "Sixteen ", "Seventeen ", "Eighteen ", "Nineteen " };

      string[] words2 = { "Twenty", "Thirty ", "Forty ", "Fifty ", "Sixty ", "Seventy ", "Eighty", "Ninety " };

      string[] words3 = { "Thousand ", "Lakh ", "Crore " };

      num[0] = number % 1000; // units

      num[1] = number / 1000;

      num[2] = number / 100000;

      num[1] = num[1] - 100 * num[2]; // thousands

      num[3] = number / 10000000; // crores

      num[2] = num[2] - 100 * num[3]; // lakhs
      for (int i = 3; i > 0; i--)
      {
          if (num[i] != 0)
          {
              first = i;
              break;
          }
      }
      for (int i = first; i >= 0; i--)
      {
          if (num[i] == 0) continue;

          u = num[i] % 10; // ones

          t = num[i] / 10;

          h = num[i] / 100; // hundreds

          t = t - 10 * h; // tens

          if (h > 0) sb.Append(words0[h] + "Hundred ");

          if (u > 0 || t > 0)
          {
              if (h > 0 || i == 0) sb.Append("and ");
              if (t == 0)
                  sb.Append(words0[u]);

              else if (t == 1)
                  sb.Append(words[u]);
              else
                  sb.Append(words2[t - 2] + words0[u]);
          }

          if (i != 0) sb.Append(words3[i - 1]);
      }
      return sb.ToString().TrimEnd();

  }