asp 中创建日志打印文件夹

string FilePath = HttpRuntime.BinDirectory.ToString();
                    string FileName = FilePath + "日志" + "\" + System.DateTime.Now.ToString("yyyyMMdd") + ".txt";
                    //判断有无当天txt文档，没有则创建
                    if (!File.Exists(FileName))
                    {
                        //创建日志文件夹
                        Directory.CreateDirectory(FilePath + "日志");
                        StreamWriter sw = File.CreateText(FileName);
                        sw.Write(command.ExecuteScalar().ToString());
                        sw.Close();
                    }