1.         public int OctToDecimal(string data)
            {
                int result = 0;
                char[] numbers = data.ToCharArray();
                int ASCIIZero = 48;
                int ASCIIEight = 56;
                try
                {
                    if (!IsNumeric(data))
                        error = "Invalid Value - This is not a numeric value";
                    else
                    {
                        for (int counter = numbers.Length; counter > 0; counter--)
                        {
                            byte[] ascii = Encoding.ASCII.GetBytes (numbers[counter - 1].ToString ());
                            if ((int.Parse ( ascii[0].ToString ()) < ASCIIZero ) && (int.Parse ( ascii[0].ToString ()) > ASCIIEight ))
                                error = "Invalid Value - This is not a oct number";
                            else
                            {
                                int num = int.Parse(numbers[counter - 1].ToString());
                                int exp = numbers.Length - counter;
                                result += (Convert.ToInt16(Math.Pow(8, exp)) * num);
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    error = ex.Message;
                }
                return result;
            }
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