public void LoginToBackoffice()
        {
            if (_requestHandler.Cookies.Count != 0)
            {
                return;
            }

            _viewState.Backoffice.LoginUrl = FindBackofficeLoginUrl();

            var loginData = string.Format("j_username={0}&j_password={1}&submit=", _viewState.Backoffice.UserName, _viewState.Backoffice.Password);

            var loginUrl = string.Format("{0}/j_spring_security_check", _viewState.Backoffice.LoginUrl);

            _requestHandler.ExecutePost(loginUrl, loginData, true);
        }