public int AddAlternateRoster(int cid, int uid)
 {
     var newAlternateRoster = new AlternateRosterEntry { user_id = uid, class_id = cid };
     context.AlternateRoster.Add(newAlternateRoster);
     var result = context.SaveChanges();
     return result;
 }
 public void DropAlternateRoster(AlternateRosterEntry student)
 {
     context.AlternateRoster.Remove(student);
 }