private void btnThemLoaiQuangCao_Click(object sender, EventArgs e) { FormLoaiQuangCao diaglogLoaiQuangCao = new FormLoaiQuangCao(); diaglogLoaiQuangCao.StartPosition = FormStartPosition.CenterScreen; if (diaglogLoaiQuangCao.ShowDialog(this) == DialogResult.Yes) { } else { cbLoaiQuangCao.DataSource = loaiQuangCaoBLL.LayDanhSachLoaiQuangCao(); } }