public int CreateAssignment(int teacherId, string subject, string title, string exercise, DateTime date, DateTime deadline)
        {
            Assignment asg = new Assignment();
            asg.Teacher = new Person(teacherId);
            asg.Subject = subject;
            asg.Title = title;
            asg.Exercise = exercise;
            asg.Date = date;
            asg.Deadline = deadline;

            asgDb = new AssignmentDb();

            return asgDb.CreateAssignment(asg);
        }
        public int CreateAssignment(int teacherId, string subject, string title, string exercise, DateTime date, DateTime deadline)
        {
            PersonCtrl usCtrl = new PersonCtrl();

            Assignment ass = new Assignment();
            ass.teacher = (Teacher)usCtrl.GetPerson(teacherId);
            ass.subject = subject;
            ass.title = title;
            ass.exercise = exercise;
            ass.date = date;
            ass.deadline = deadline;

            AssignmentDb assDb = new AssignmentDb();

            return assDb.CreateAssignment(ass);
        }