C#WinForm的DataGridView控件顯示行號

　　　public void ShowIndex(DataGridView dgv)
        {          
            for (int i = 0; i < dgv.Rows.Count; i++)
            {              
                dgv.Rows[i].HeaderCell.Value = (i+1).ToString();  //HeaderCell獲取或設置行的標頭單元格            
            }
        }