​​最简单的方法是在Datagridview的事件RowPostPaint事件下面添加如下代码即可​​

private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
 
        {
            SolidBrush b = new SolidBrush(this.dataGridView1.RowHeadersDefaultCellStyle.ForeColor);
            e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture), this.dataGridView1.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);
 
 
        }