why not have some helpful two way XElement, strings maps :)

gistfile1.txt

        public static IEnumerable<System.Xml.Linq.XElement> ToXElement(this IEnumerable<string> source, string tag = "Value")
        {
            return source.Select(s => new System.Xml.Linq.XElement(tag, s));
        }
        public static IEnumerable<string> ToStrings(this System.Xml.Linq.XElement source, string tag = "Value")
        {
            return source.Elements("Value").Select(e => (string)e);
        }