FileUpload控件实现图片上传与数据库存储

try
        {
            string name = FileUpload1.FileName;
            string size = FileUpload1.PostedFile.ContentLength.ToString();
            string type = name.Substring(name.LastIndexOf(".") + 1).ToLower();

            if (type == "jpg" || type == "png" || type == "bmp" || type == "gif" || type == "jpeg")
            {
                try
                {
                    ImgUploads iu = new ImgUploads(DropDownList1.SelectedItem.Text);
                    String id=iu.GetMaxId();//获取数据库最大ID号用来命名图片
                    String ReName = id + "." + type;//图片重命名

                    String Ipath = Server.MapPath("~/hy/upimg") + "\\" + ReName;//文件实际路径
                    FileUpload1.SaveAs(Ipath);//上传到图片目录

                    String Tpath = Server.MapPath("~/hy/thumbar") + "\\" + ReName;//缩略图路径
                    PictureSlightly.MakeImage(Ipath,Tpath,100,130,"hw");//生成缩略图

//上传到数据库
                    iu.UpImg(Convert.ToInt32(id),DropDownList1.SelectedItem.Text,ReName.ToString());

                    Label1.Text = "上传成功,图片大小:" + size + "B";
                    this.thumbar.Src = "~/hy/thumbar/" + ReName;
                }
                catch(Exception ex)
                {
                    Page.RegisterStartupScript("error", "<script>alert('图片上传失败,请重试!"+ex.Message.ToString()+"');</script>");
                }