/// <summary>
        /// Initializes a new instance of the <see cref="T:LoginBLL"/> class.
        /// </summary>
        /// <param name="connectionName">Name of the connection.</param>
        private LoginBLL(string connectionName)
        {
            userDao            = UserDAO.GetInstance(connectionName);
            userOrgDao         = UserOrgDAO.GetInstance(connectionName);
            userRoleDao        = UserRoleDAO.GetInstance(connectionName);
            userRegionDao      = UserRegionDAO.GetInstance(connectionName);
            userRegionRangeDao = UserRegionRangeDAO.GetInstance(connectionName);

            userOrgRoleDAO = UserOrgRoleDAO.GetInstance(connectionName);
            userSystemDao  = UserSystemDAO.GetInstance(connectionName);
        }
        /// <summary>
        /// Initializes a new instance of the <see cref="T:LoginBLL"/> class.
        /// </summary>
        private LoginBLL()
        {
            userDao            = UserDAO.GetInstance();
            userRoleDao        = UserRoleDAO.GetInstance();
            userOrgDao         = UserOrgDAO.GetInstance();
            userRegionDao      = UserRegionDAO.GetInstance();
            userRegionRangeDao = UserRegionRangeDAO.GetInstance();

            userOrgRoleDAO = UserOrgRoleDAO.GetInstance();
            userAreaDAO    = UserAreaDAO.GetInstance();
            userSystemDao  = UserSystemDAO.GetInstance();
        }