/// <summary>
        /// Refreshes the security token.
        /// </summary>
        /// <param name="securityToken"></param>
        public void RefreshToken(string securityToken)
        {
            _securityToken = securityToken;

            if (_employeeService != null)
            {
                _employeeService.RefreshToken(_securityToken);
            }
            if (_visitorService != null)
            {
                _visitorService.RefreshToken(_securityToken);
            }
            if (_visitService != null)
            {
                _visitService.RefreshToken(_securityToken);
            }
            if (_securityService != null)
            {
                _securityService.RefreshToken(_securityToken);
            }
            if (_visitorPictureService != null)
            {
                _visitorPictureService.RefreshToken(_securityToken);
            }
        }