private void btnLuu_Click(object sender, EventArgs e) { if (txtMaThucDon.Text.Trim() != "") { ucThucDon.SaoLuuThucDon(cboNhomTre.SelectedValue.ToString(), txtMaThucDon.Text.Trim(), this); this.Enabled = false; } else { ThongBaoChuaNhapTenThucDon(); } }