public void addenrollment(enrollment u)
        {
            tema2psEntities entities = new tema2psEntities();

            entities.enrollments.Add(u);
            entities.SaveChanges();
        }
        public enrollment getenrollmentbyID(int id)
        {
            tema2psEntities entities = new tema2psEntities();
            enrollment      u        = new enrollment();

            foreach (enrollment uDB in entities.enrollments)
            {
                if (uDB.id == id)
                {
                    u = uDB;
                }
            }
            return(u);
        }
        public void updateenrollment(enrollment u)
        {
            tema2psEntities entities = new tema2psEntities();

            foreach (enrollment uDB in entities.enrollments)
            {
                if (uDB.id == u.id)
                {
                    uDB.userID   = u.userID;
                    uDB.courseID = u.courseID;
                    uDB.grade    = u.grade;
                }
            }
            entities.SaveChanges();
        }