public ActionResult Create(Agenda agenda)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    agenda.EmpresaID = Convert.ToInt32(User.FindFirst(ClaimTypes.GroupSid).Value);

                    AgendaService service = new AgendaService();
                    service.PreencherCampos(agenda);

                    _agenda.Inserir(agenda);
                    return(RedirectToAction(nameof(Index)));
                }
                return(View(agenda));
            }
            catch (Exception ex)
            {
                Mensagem = ex.Message.ToString();
                ModelState.AddModelError(String.Empty, Mensagem);
                return(View(agenda));
            }
        }