Made New Method and it Worked

public string RemoveUnWantedCharsfromXml(string XmlFile)
        {
            string Xml = string.Empty;
            Regex regex = new Regex(@"-[0-9]+-", RegexOptions.IgnoreCase);
            if (regex.IsMatch(XmlFile))
                Xml = regex.Replace(XmlFile, String.Empty);
            return Xml;
        }



san i couldn;t use method bcuz it kept giving me error in String.Join
The best overload method is string[]