创建临时文件及删除的方法

//文件名

 string fName = string.Format("{0}{1}", DateTime.Now.ToString(CommonDefine.DATETIME_FORMAT_LIST),
                           this.fUpload.PostedFile.FileName.Substring(this.fUpload.PostedFile.FileName.LastIndexOf(".")));
                    if (!Directory.Exists(Server.MapPath("XSL")))
                    {
                        Directory.CreateDirectory(Server.MapPath("XSL"));
                    }
                    string path = Server.MapPath(string.Format("XSL\{0}", fName));//待读取Excel的全路径，临时文件路径
                    this.fUpload.PostedFile.SaveAs(path);//将上传文件重新保存在XSL临时文件夹下

//do sth

//删除临时文件

   //把上传的文件删除
                    if (File.Exists(Server.MapPath(string.Format("XSL\{0}", fName))))
                    {
                        File.Delete(Server.MapPath(string.Format("XSL\{0}", fName)));
                    }