public Report()
{
StudentDao studentDao = new StudentDao();
students = studentDao.GetAll();
StudentGradeDao studentGradeDao = new StudentGradeDao();
grades = studentGradeDao.GetAll();
SubjectDao subjectDao = new SubjectDao();
subjects = subjectDao.GetAll();
ExaminationDao examinationDao = new ExaminationDao();
examinations = examinationDao.GetAll();
SessionDao sessionDao = new SessionDao();
sessions = sessionDao.GetAll();
GroupDao groupDao = new GroupDao();
groups = groupDao.GetAll();
}