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显示结果如下图：

http://s9/mw690/9c47a152gx6BIgvj7iU88&690

设置方法：

在DataGridView的RowPostPaint事件中进行绘制；

        private void DataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Rectangle rectangle = new Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, DataGridView1.RowHeadersWidth - 4, e.RowBounds.Height);
            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), DataGridView1.RowHeadersDefaultCellStyle.Font, rectangle, DataGridView1.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
        }

运行程序即可显示行号；