public NhaXuatBanFunction()
{
db = new QuanLiThuVienDB();
}
public TheLoaiFunction()
{
db = new QuanLiThuVienDB();
}
public SachFunction()
{
db = new QuanLiThuVienDB();
}
public TacGiaFunction()
{
db = new QuanLiThuVienDB();
}