private void btnSua_Click(object sender, EventArgs e)
{
SachDTO s = new SachDTO();
s.MaSach = txtMaSach.Text;
s.TenSach = txtTenSach.Text;
s.MaDauSach = cbbDauSach.SelectedValue.ToString();
s.TenTacGia = txtTacGia.Text;
s.MaTheLoai = cbbDauSach.SelectedValue.ToString();
s.TenNhaXuatBan = txtNhaXuatBan.Text;
s.NamXuatBan = Int32.Parse(txtNamXuatBan.Text);
s.SoLuong = Convert.ToInt32(txtSoLuong.Text);
s.DonGia = Convert.ToDecimal(txtGiaTien.Text);
s.SachHiem = chkSachHiem.Checked ? true : false;
sachBUS.Editbook(s);
MessageBox.Show(Constrant.SuaThanhCong, Constrant.ThongBao, MessageBoxButtons.OK, MessageBoxIcon.Information);
frmBooks_Load(sender, e);
}