public BLSystemUser ChargeUser(string code)
        {
            DAOSystemUser dv = new DAOSystemUser();

            if (!dv.checkNameUser(code))
            {
                SystemUser user = dv.ChargeUser(code);
                return(new BLSystemUser(user.SystemUserName, user.SystemUserPassword, user.SystemUserRole));
            }
            else
            {
                return(null);
            }
        }
        public bool addUser(BLSystemUser user)
        {
            DAOSystemUser dv     = new DAOSystemUser();
            SystemUser    toUser = new SystemUser()
            {
                SystemUserName = user.SystemUserName, SystemUserPassword = user.SystemUserPassword, SystemUserRole = user.SystemUserRole
            };

            if (dv.checkNameUser(toUser.SystemUserName))
            {
                dv.addUser(toUser);
                return(true);
            }
            return(false);
        }