public StudentViewModel(Student student, ExamDbContext db)
 {
     this.db              = db;
     CurrentStudent       = student;
     CurrentStudyingVM    = new TopicsViewModel(db, ShowTheory, ShowTasks);
     CurrentChatViewModel = new ChatViewModel(db, CurrentStudent.User, CurrentStudent.Teacher.User);
     CurrentStatisticsVM  = new StatisticsViewModel(CurrentStudent, db);
     CurrentPlanViewModel = new PlanViewModel(CurrentStudent, db);
 }
 private void ShowThemes()
 {
     CurrentStudyingVM = new TopicsViewModel(db, ShowTheory, ShowTasks);
 }