private void dgvRelation_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)

        {

            try

            {

                SolidBrush b = new SolidBrush(this.dgvRelation.RowHeadersDefaultCellStyle.ForeColor);

                e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture),

                    this.dgvRelation.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);

            }

            catch { return; }

        }