void Uploader_FileUploaded(object sender, UploaderEventArgs args)
        {
            if (string.IsNullOrEmpty(this.UploadFolder))
            {
                this.UploadFolder = "Upload";
            }

            this.UploadFolder = "/" + this.UploadFolder + "/" + DateTime.Today.ToString("yyyy-MM-dd") + "/";

            if (!Directory.Exists(this.MapPath(this.UploadFolder)))
            {
                Directory.CreateDirectory(this.MapPath(this.UploadFolder));
            }

            args.CopyTo(UploadFolder + args.FileName);
            img1.ImageUrl        = this.UploadFolder + args.FileName;
            img1.Visible         = true;
            Uploader1.InsertText = "更改图片";
            imgPath.Value        = img1.ImageUrl;
        }