public static TheLoaiSachUI convertToUI(TheLoaiSach theLoaiSach) {
   TheLoaiSachUI tLUI = new TheLoaiSachUI();
   if (theLoaiSach != null) {
     tLUI.setMaTheLoai(theLoaiSach.getTenTheLoai());
     tLUI.setTenTheLoai(theLoaiSach.getTenTheLoai());
   }
   return tLUI;
 }
 public static TheLoaiSach convertToTheLoaiSach(TheLoaiSachUI theLoaiSachUI) {
   TheLoaiSach tlS = new TheLoaiSach();
   if (tlS != null) {
     tlS.setMaTheLoai(theLoaiSachUI.getMaTheLoai());
     tlS.setTenTheLoai(theLoaiSachUI.getTenTheLoai());
   }
   return tlS;
 }