case ValueDataType.Double:
            #region Double

            NumberFormatInfo localNumberFormatInfo = NumberFormatInfo.CurrentInfo;
            string currencyDecimalSeparator = localNumberFormatInfo.CurrencyDecimalSeparator;
            string currencyGroupSeparator = localNumberFormatInfo.CurrencyGroupSeparator;
            string regExpDouble = string.Empty;

            if (currencyGroupSeparator[0] == '\x00a0')
              currencyGroupSeparator = " ";

            //if (digits.HasValue)
            //{
            StringBuilder sb = new StringBuilder();
            sb.Append(@"^\s*([-\+])?(((\d+)\");
            sb.Append(currencyGroupSeparator);
            sb.Append(@")*)(\d+)");

            if (!digits.HasValue)
              sb.Append(@"(\" + currencyDecimalSeparator + @"(\d+))?");
            else if (digits.Value > 0)
              sb.Append(@"(\" + currencyDecimalSeparator + @"(\d{1," + digits.Value.ToString() + "}))?");

            sb.Append(@"?\s*$");

            regExpDouble = sb.ToString();
            //}
            //else
            //{
            //    string[] textArray1 = new string[5] 
            //    { 
            //    @"^\s*([-\+])?(((\d+)\", 
            //    currencyGroupSeparator, 
            //    @")*)(\d+)", 
            //    @"(\" + currencyDecimalSeparator + @"(\d*))?", 
            //    @"?\s*$" 
            //    };
            //    regExpDouble = string.Concat(textArray1);
            //}

            Match regMatch = Regex.Match(text, regExpDouble);
            if (regMatch.Success)
            {
              StringBuilder strBuilder = new StringBuilder();
              strBuilder.Append(regMatch.Groups[1]);

              foreach (Capture regCapture in regMatch.Groups[4].Captures)
                strBuilder.Append(regCapture.Value);

              strBuilder.Append(regMatch.Groups[5]);

              if (!digits.HasValue || (digits.Value > 0))
              {
                strBuilder.Append(".");
                strBuilder.Append(regMatch.Groups[7].Value);
              }

              value = decimal.Parse(strBuilder.ToString(), CultureInfo.InvariantCulture);
            }

            #endregion
            break;
        }