C#datagridview自动编号

1,先在加入如下代码 
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); 
} 

2，然后再在From1.Designer.cs文件中加入如下代码，就行了。  

this.dataGridView1.RowPostPaint += new System.Windows.Forms.DataGridViewRowPostPaintEventHandler(this.dataGridView1_RowPostPaint);