DataGridView显示行号

//可以在DataGirdView的RowPostPaint事件中进行绘制。
//如：添加以下方法代码 

private void DrawRowIndex(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
               e.RowBounds.Location.Y,
               this.costomerDataGridView.RowHeadersWidth - 4,
               e.RowBounds.Height);

            TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
                this.costomerDataGridView.RowHeadersDefaultCellStyle.Font,
                rectangle,
                this.costomerDataGridView.RowHeadersDefaultCellStyle.ForeColor,
                TextFormatFlags.VerticalCenter | TextFormatFlags.Right);

        }
//即可完成显示行号的功能。