public void GetDataFromDb()
{
Groups = GroupRepo.GetGroupsFromDb();
Teachers = TeacherRepo.GetTeachersFromDb();
Rooms = RoomRepo.GetRoomsFromDb();
GroupSubjects = GroupSubjectRepo.GetGroupSubjectsFromDb();
TeacherSubjects = TeacherSubjectRepo.GetTeacherSubjectsFromDb();
Subjects = SubjectRepo.GetSubjectsFromDb();
}