C# datagridview显示行号

        /// <summary>        /// 显示行号，在datagridview1的RowPostPaint事件中重绘        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)        {            using (SolidBrush b = new SolidBrush(dataGridView1.RowHeadersDefaultCellStyle.ForeColor))            {                string linenum = e.RowIndex.ToString();                int linen = 0;                linen = Convert.ToInt32(linenum) + 1;                string line = linen.ToString();                e.Graphics.DrawString(line, e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 10, e.RowBounds.Location.Y + 5);                SolidBrush B = new SolidBrush(Color.Red);            }        }