//建立臨時文件
                    　　string tempFile = Path.GetTempFileName();
　　　　　　　　　　　　　　string ls_fileNeme = System.IO.Path.ChangeExtension(ls_file, ".rep");
                        File.Move(ls_file, ls_fileNeme);//修改文件擴展名
                        using (FileStream fs = new FileStream(ls_fileNeme, FileMode.Open))
                        {
                            StreamWriter sw 
 
= new StreamWriter(fs, Encoding.Unicode);
                            sw.WriteLine("what are you doing");
                            sw.Flush();
                            sw.Close();
                        }        

c# 建立臨時文件 並寫入數據