DataGridView显示行号

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 //显示行号        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);        }