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                    string path = "...\\Debug\\log.txt";
                    if (!File.Exists(path))
                    {
                        StreamWriter sw1;
                        sw1 = File.CreateText(path);
                        sw1.Close();
                    }
                    string str = System.DateTime.Now.Year.ToString() + "Äê" + System.DateTime.Now.Month.ToString() + "ÔÂ" + System.DateTime.Now.Day.ToString() + "ÈÕ " + System.DateTime.Now.Hour.ToString() + ":" + System.DateTime.Now.Minute.ToString() + ":" + System.DateTime.Now.Second.ToString() + "  " + "Êý¾ÝWeb·þÎñÎÞ·¨·ÃÎÊ»òÕßÍøÂ粻ͨ. ";
                    StreamWriter sw = File.AppendText(path);
                    sw.WriteLine(str);
                    sw.Close();
                    return;