public void updatePwd(string user_ID, string pwd)
        {
            string    salt;
            Crypto_BO crypto = new Crypto_BO();

            crypto.password_crypto(user_ID, pwd);
            pwd  = crypto.hashedPassword;
            salt = crypto.salt;
            userDAO userdao = new userDAO();

            userdao.updatePwd(user_ID, pwd, salt);
        }