private void ucTiepNhanSachMoi_Load(object sender, EventArgs e)
{
cboTheLoaiSach.DataSource = xldl.ChonTheLoaiSach_Select(dl);
cboTheLoaiSach.DisplayMember = "Ten_TheLoaiSach";
cboTheLoaiSach.ValueMember = "ID_TheLoaiSach";
txtGioiHanXuatBan.DataBindings.Clear();
txtGioiHanXuatBan.DataBindings.Add("Text", xldl.LayGioiHanXuatBan_Select(dl), "NamXuatBan");
cboTacGia.DataSource = xldl.ChonTacGiaSach_Select(dl);
cboTacGia.DisplayMember = "Ten_TacGia";
cboTacGia.ValueMember = "ID_TacGia";
dtgSach.DataSource = xldl.Sach_Select(dl);
}