private void btn_run_Click(object sender, RoutedEventArgs e)
        {
            UnderGrad u1 = new UnderGrad("Craig", "10004794", "3"); UnderGrad u2 = new UnderGrad("Scott", "10004794", "6"); UnderGrad u3 = new UnderGrad("Leigh", "10004794", "1"); UnderGrad u4 = new UnderGrad("Chris", "10004794", "8");
            PostGrad p1 = new PostGrad("Mark", "10004767", "3");
            Lecturer l1 = new Lecturer("Kevin", "Games Enginnering");

            l1.Teaches(u1); l1.Teaches(p1); l1.Teaches(u2); l1.Teaches(u3); l1.Teaches(u4);
            l1.update();

               ;
        }
        private void btn_run_Click(object sender, RoutedEventArgs e)
        {
            UnderGrad u1 = new UnderGrad("Craig", "10004794", "3"); UnderGrad u2 = new UnderGrad("Scott", "10004794", "6"); UnderGrad u3 = new UnderGrad("Leigh", "10004794", "1"); UnderGrad u4 = new UnderGrad("Chris", "10004794", "8");
            PostGrad  p1 = new PostGrad("Mark", "10004767", "3");
            Lecturer  l1 = new Lecturer("Kevin", "Games Enginnering");

            l1.Teaches(u1); l1.Teaches(p1); l1.Teaches(u2); l1.Teaches(u3); l1.Teaches(u4);
            l1.update();

            ;
        }