DataGridView添加行号

用DataGridView的RowPostPaint事件在RowHeaderCell中绘制行号：
 

RowPostPaint
       private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            try
            {
                //添加行号 
                SolidBrush v_SolidBrush = new SolidBrush(dataGridView1.RowHeadersDefaultCellStyle.ForeColor);
                int v_LineNo = 0;
                v_LineNo = e.RowIndex + 1;

                string v_Line = v_LineNo.ToString();

                e.Graphics.DrawString(v_Line, e.InheritedRowStyle.Font, v_SolidBrush, e.RowBounds.Location.X + 15, e.RowBounds.Location.Y + 5);

            }
            catch (Exception ex)
            {
                MessageBox.Show("添加行号时发生错误，错误信息：" + ex.Message, "操作失败");
            }
        }