public void EnrolInstructorToCourse(int courseID, int instructorID)
        {
            using (ENET_Project_Active_Learning_Group4Entities db = new ENET_Project_Active_Learning_Group4Entities())
            {
                Instructor_Course_Map map = new Instructor_Course_Map();
                map.InstructorSid = instructorID;
                map.CourseSid     = courseID;

                db.Instructor_Course_Map.Add(map);
                db.SaveChanges();
            }
        }
        public void RemoveInstructorFromCourse(int courseID, int instructorID)
        {
            using (ENET_Project_Active_Learning_Group4Entities db = new ENET_Project_Active_Learning_Group4Entities())
            {
                Instructor_Course_Map map = null;

                foreach (var course in db.Instructor_Course_Map)
                {
                    if (course.InstructorSid == instructorID && course.CourseSid == courseID)
                    {
                        map = course;

                        break;
                    }
                }

                if (map != null)
                {
                    db.Instructor_Course_Map.Remove(map);
                    db.SaveChanges();
                }
            }
        }