private async void ShowSchedule()
        {
            if (Application.Current.Properties.ContainsKey("groupId"))
            {
                var groupId   = (int)Application.Current.Properties["groupId"];
                var groupName = Application.Current.Properties["groupName"].ToString();
                GroupName.Text = groupName + " сыныбына арналған сабақ кестесі";
                try
                {
                    var schedule = new List <Day>();
                    ScheduleTable.IsRefreshing = true;
                    var days = await GetDaysAsync(groupId);

                    ScheduleTable.IsRefreshing = false;
                    if (days != null)
                    {
                        foreach (var item in days)
                        {
                            var day = new Day {
                                DayOfWeek = DictionaryHelper.GetDayOfWeekName((int)item.DayOfWeek)
                            };
                            var lessons = new List <Lesson>();
                            foreach (var itemLesson in item.Lessons)
                            {
                                var lesson = new Lesson
                                {
                                    Order       = itemLesson.Order,
                                    TeacherName = itemLesson.TeacherName,
                                    SubjectName = itemLesson.SubjectName
                                };
                                lessons.Add(lesson);
                            }
                            day.Lessons = lessons;
                            schedule.Add(day);
                        }
                    }
                    Days = new ObservableCollection <Day>(schedule);
                    ScheduleTable.ItemsSource = Days;
                }
                catch (Exception e)
                {
                    await DisplayAlert("Серверге қосылу мүмкін емес", "Интернет қосылуын тексеріңіз", "OK");

                    return;
                }
            }
        }