public void Update(Teacher teacher)
        {
            var actualteacher = _context.Teachers.Where(s => s.Id == teacher.Id).AsNoTracking().FirstOrDefault();

            actualteacher.EnrollmentId = teacher.EnrollmentId;

            _context.Entry(actualteacher).State = EntityState.Modified;

            _context.SaveChanges();
        }
        public void Update(Student student)
        {
            var actualStudent = _context.Students.Where(s => s.Id == student.Id).AsNoTracking().FirstOrDefault();

            actualStudent.EnrollmentDate = student.EnrollmentDate;
            actualStudent.EnrollmentId   = student.EnrollmentId;

            _context.Entry(actualStudent).State = EntityState.Modified;

            _context.SaveChanges();
        }