public string check_number(string num_str)

        {



            num_str = num_str.Trim();



            if (Regex.IsMatch(num_str, @"^\d+(\.\d+)?$|^\d+(\,\d+)+(\.\d+)?$"))

            {

                this.Nonum = true;

                return num_str.Replace(",", "");

            }

            else

            {

                this.Nonum = false;

                return num_str;



            }



        

        }



eg:1.00

123,123

456,123.00