C# 读取Text文本，写入Text文本

//读取
    private void showMess()
        {
            this.dataGridViewX2.Rows.Clear();
            //将车辆信息一行行添加到datagreatview  里面
            StreamReader sr = File.OpenText("C:\Users\Administrator\Desktop\CarMessages.txt");
            string line;
            int i = 0;

            List<string> list = new List<string>();
            while ((line = sr.ReadLine()) != null)
            {


                list.Add(line);
                i++;

            }
            dataGridViewX2.Rows.Add(i);
            int qq = list.Count;
            for (int a = 0; a < qq; a++)
            {
                dataGridViewX2.Rows[a].Cells[0].Value = list[a].ToString();
            }
            //列宽自适应
            dataGridViewX2.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
            dataGridViewX2.ReadOnly = true;
        }

写入Text

 try
                {
                    MultiFormatWriter mutiWriter = new com.google.zxing.MultiFormatWriter();
                    ByteMatrix bm = mutiWriter.encode( table.Rows[0]["CarID"].ToString() , com.google.zxing.BarcodeFormat.QR_CODE, 363, 150);
                    Bitmap img = bm.ToBitmap();



                    string filename = "C:\Users\Administrator\Desktop\Car_Messages\" + table.Rows[0]["MenName"].ToString()  + table.Rows[0]["CarID"].ToString() + ".jpg";
                    img.Save(filename, System.Drawing.Imaging.ImageFormat.Jpeg);

                }
                catch (Exception ee)
                { MessageBox.Show(ee.Message); }
            }