IsValidPath

        /// <summary>
        /// Gets whether the specified path is a valid absolute file path.
        /// </summary>
        /// <param name="path">Any path. OK if null or empty.</param>
        static public bool IsValidPath(string path) {
            Regex r = new Regex(@"^(([a-zA-Z]\:)|(\\))(\\{1}|((\\{1})[^\\]([^/:*?<>""|]*))+)$");
            return r.IsMatch(path);
        }