上传异常？

Question

程序在A电脑运行可以正常上传下载文件。 到了B电脑（Server）却不能上传了，提交上传文件时只是刷新一下页面？ 不知道是什么问题。。是文件夹的权限问题吗？ 本人现纠结中，请路人解之，very xx 部分源码： string reName = updateTime.ToShortDateString() + "_" + rName + "_" + docType + lastNamestring filePath ="/UPLOADFILES/" + id + "/" + reName;string filePathDir = Server.MapPath("/UPLOADFILES/" + id + "/");if (!File.Exists(filePath)) {  Directory.CreateDirectory(filePathDir);  string upfilePath = Server.MapPath("/UPLOADFILES/" + id + "/") +reName; myFile.PostedFile.SaveAs(upfilePath);                       if (!this.InsertDocInfo(jobno, docType, reName, fileSize, updateTime, Remark,type,filePath))          {        　　　　 Response.Write("<script>alert('Upload file successfully! File information written to the database failed!')</script>");               this.ClearLog();