public ModelStateDictionary Validate() {
                List<Schedule> iSchedules = _DB.Schedule.Where(s => s.SalaoId == Salao).ToList();
                String iErrorMessage = "Já existe um evento cadastrado para este salão neste intervalo.";

                if (iSchedules.Count > 0) {
                    foreach (var iSchedule in iSchedules) {
                        if (iSchedule.MenuId == (int)SubMenuEnum.Hall) {
                            if (Start.Date.Equals(iSchedule.StartDate.Date) || Final.Date.Equals(iSchedule.FinalDate.Date)) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (Start.Date < iSchedule.StartDate.Date &&
                                 Final.Date >= iSchedule.StartDate.Date) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (Final.Date > iSchedule.FinalDate.Date &&
                                Start.Date <= iSchedule.FinalDate.Date) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (Start.Date > iSchedule.StartDate.Date &&
                                Final.Date < iSchedule.FinalDate.Date) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }
                        } else if (iSchedule.MenuId == (int)SubMenuEnum.SoccerField &&
                            Start.ToShortDateString().Equals(iSchedule.StartDate.ToShortDateString())) {
                            if (StartTime.TimeOfDay.Equals(iSchedule.StartDate.TimeOfDay) ||
                                FinalTime.TimeOfDay.Equals(iSchedule.FinalDate.TimeOfDay)) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (StartTime.TimeOfDay < iSchedule.StartDate.TimeOfDay &&
                                 FinalTime.TimeOfDay >= iSchedule.StartDate.TimeOfDay) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (FinalTime.TimeOfDay > iSchedule.FinalDate.TimeOfDay &&
                                StartTime.TimeOfDay <= iSchedule.FinalDate.TimeOfDay) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }

                            if (StartTime.TimeOfDay > iSchedule.StartDate.TimeOfDay &&
                                FinalTime.TimeOfDay < iSchedule.FinalDate.TimeOfDay) {
                                _ModelState.AddModelError("", iErrorMessage);
                                break;
                            }
                        }
                    }
                }

                return _ModelState;
            }