protected void DoDeleteUser(string username)
        {
            AppUser u = new AppUser();
            u._username = username;

            DBManager db = new MySQLDBManager(Config.DB_SERVER, Config.DB_NAME, Config.DB_USER, Config.DB_PASSWORD, Config.DB_CHAR_ENC);
            db.Connect();
            u.DeleteToDB(db);
            db.Close();
        }