protected void btnUpload_Click(object sender, EventArgs e)        {            HttpFileCollection Files = HttpContext.Current.Request.Files;            for (int i = 0; i < Files.Count; i++)            {                HttpPostedFile PostedFile = Files[i];                if (PostedFile.ContentLength > 0)                {                    string FileName = PostedFile.FileName;                    string strExPrentFile = FileName.Substring(FileName.LastIndexOf(".") + 1);                    string sFilePath = "/uploadfile/hotel/" + StringClass.makeFileName24() + i + strExPrentFile;                    PostedFile.SaveAs(Server.MapPath(sFilePath));                }                else                {                    //this.LabMessage.Text = "不能上传空文件";                }            }        }