private async Task GetFacultiesCourses(Faculty faculty)
        {
            Busy = true;

            string url = "https://altaarefapp.azurewebsites.net/api/FacultyCourses/GetCoursesByFacultiesId/" + faculty.Id;

            string content = await _client.GetStringAsync(url);

            var crses = JsonConvert.DeserializeObject <List <Courses> >(content);

            List <CourseInList> crsList = new List <CourseInList>();
            CourseInList        crsView;

            foreach (var c in crses)
            {
                crsView           = new CourseInList();
                crsView.FacultyId = faculty.Id;
                crsView.Course    = c;
                crsView.IsChecked = false;
                crsList.Add(crsView);
            }

            //List<Section> seclist = new List<Section>();
            //Section sec = new Section { FacultyId = faculty.Id, Text = faculty.Name, List = crsList };
            //seclist.Add(sec);

            ListOfListsOfCourses.Add(crsList);

            Busy = false;
        }
        private void HandleItemTapped(CourseInList courses)
        {
            AddOrRemoveCourseFromCoursesList(courses.Course);

            ViewModel.List.Find(sec => sec.FacultyId == courses.FacultyId)
            .List.Find(crslist => crslist.Course.Id == courses.Course.Id).IsChecked = !courses.IsChecked;
        }