在DataGridView中自动添加行号到因定列上

       在dataGridView1_RowPostPaint() 事件下添加下列代码可以实现在DataGridView中自动添加行号到因定列上

            using (SolidBrush b = new SolidBrush(dataGridView1.RowHeadersDefaultCellStyle.ForeColor))
            {
                e.Graphics.DrawString(Convert.ToString(e.RowIndex + 1, System.Globalization.CultureInfo.CurrentUICulture), e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);
            }