internal IList<DepartMajor> GetAllDepartMajor(string teacherDepart)
 {
     IDepartMajorDao departMajorDao = new DepartMajorDao(sessionFactory);
     IList<DepartMajor> departMajorList=departMajorDao.GetDepartMajor(teacherDepart);
     return departMajorList;
 }
 public IList<DepartMajor> GetDepartMajorList(string departName)
 {
     IDepartMajorDao departMajorDao = new DepartMajorDao(sessionFactory);
     try
     {
         return departMajorDao.GetDepartMajorList(departName);
     }
     catch (Exception e)
     {
         return null;
     }
 }