[GDI]DataGridView的序号

private void datagv_det_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
 {

SolidBrush b = new SolidBrush(this.datagv_det.RowHeadersDefaultCellStyle.ForeColor);
  e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),     this.datagv_det.DefaultCellStyle.Font, b, e.RowBoun  ds.Location.X + 20, e.RowBounds.Location.Y + 4);

}