//添加学生附件
            StringBuilder bs = new StringBuilder();
            int attCount = 0;
            string filePath = "";
            string strPath = "";
            for (int j = 0; j < Request.Files.Count; j++)
            {
                if (Request.Files[j].ContentLength > 0)
                {
                    filePath = Request.Files[j].FileName;
                    strPath = Server.MapPath("~/studentfile/") + filePath.Substring(filePath.LastIndexOf("\\") + 1);
                    bs.Append("Files" + attCount++ + ": " + filePath + "<br>");
                    Request.Files[0].SaveAs(strPath);
                    string NowTime = System.DateTime.Now.ToString("yyyyMMddHHmmssffff");
                    string NewFileName = NowTime + filePath.Substring(filePath.LastIndexOf("\\") + 1);
                    string FileType = filePath.Substring(filePath.LastIndexOf("\\") + 1).ToLower();
                    sfm1.StudentFile_Name = FileType;
                    sfm1.StudentFile_FileName = strPath;
                    sfm1.StudentFile_FileMewName = NewFileName;//新文件名
                    sfm1.Student_Id = i;
                    sfb1.StudentFileAdd(sfm1);
                }
            }    怎么无论我怎么改  新文件名都如图一样(最后一列) 都是一样的。