public void GetDataFromXML()
{
Groups = GroupRepo.DeserializeArray("../../Data/groups.xml").ToList();
Teachers = TeacherRepo.DeserializeArray("../../Data/teachers.xml").ToList();
Rooms = RoomRepo.DeserializeArray("../../Data/rooms.xml").ToList();
GroupSubjects = GroupSubjectRepo.DeserializeArray("../../Data/group_subjects.xml").ToList();
TeacherSubjects = TeacherSubjectRepo.DeserializeArray("../../Data/teacher_subjects.xml").ToList();
Subjects = SubjectRepo.DeserializeArray("../../Data/subjects.xml").ToList();
}