private async void OnNextOrEnd() { _statisticItem = new StatisticItem() { ActivityId = Activities[Counter].Id, Date = DateTime.Now, Time = new DateTime() + DateTime.Now.Subtract(StartTime), Result = SliderValue }; StatisticItems.Add(_statisticItem); if (Counter < Activities.Count - 1) { ++Counter; UpdatePopupPageData(); } else { await ItemsRepository.AddStatisticItemsAsync(StatisticItems); await NavigationService.GoBackAsync(); } }