private void frmCapNhatSach_Load(object sender, EventArgs e)
{
bdsTacGia.DataSource = tgBUS.LayDanhSach();
bdsTheLoai.DataSource = tlBUS.LayDanhSach();
bdsNhaXuatBan.DataSource = nxbBUS.LayDanhSach();
SachDTO sDTO = sBUS.LaySachTheoMa(masach);
txtMaSach.Text = masach.ToString();
txtTen.Text = sDTO.Ten;
cboTacGia.SelectedValue = sDTO.MaTacGia;
cboTheLoai.SelectedValue = sDTO.MaTheLoai;
cboNhaXuatBan.SelectedValue = sDTO.MaNXB;
dtpNgayXuatBan.Value = sDTO.NgayXuatBan;
txtGhiChu.Text = sDTO.GhiChu;
}