/// <summary>
        /// Hashes a string that is url encoded as output.
        /// </summary>
        /// <param name="s">Input string</param>
        /// <returns>Hashed string with url encoding</returns>
        public static string UrlHash(string s)
        {
            // Can't encrypt empty strings
            if (s == null)
                return "";

            // Tansform the string into a byte array
            byte[] hash = encoder.GetBytes(s);

            // Hash the password with SHA512
            hash = shaHasher.ComputeHash(hash);

            // Return as BASE64 string
            HTMLSanitizer hs = new HTMLSanitizer();

            string dummy = hs.UrlEncode(Convert.ToBase64String(hash));
            return dummy.Replace('%', '1');
        }