public List<HOATDONG> LayHoatDongTheoLoai(int iMaLoai)
 {
     try
     {
         DAOHoatDong daoHoatDong = new DAOHoatDong();
         return daoHoatDong.SelectHOATDONGByLoai(iMaLoai);
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }