private void DetailDelete(string id)
        {
            sql_object sql_obj = new sql_object();
            DetailObject Detail = sql_obj.GetDetail(id);
            string imgPath;
            imgPath = "image/" + Detail.img1;
            if (File.Exists(Server.MapPath(imgPath)))
            {
                File.Delete(Server.MapPath(imgPath));
            }

            imgPath = "image/" + Detail.img2;
            if (File.Exists(Server.MapPath(imgPath)))
            {
                File.Delete(Server.MapPath(imgPath));
            }

            imgPath = "image/" + Detail.img3;
            if (File.Exists(Server.MapPath(imgPath)))
            {
                File.Delete(Server.MapPath(imgPath));
            }

            imgPath = "image/" + Detail.img4;
            if (File.Exists(Server.MapPath(imgPath)))
            {
                File.Delete(Server.MapPath(imgPath));
            }

            imgPath = "image/" + Detail.img5;
            if (File.Exists(Server.MapPath(imgPath)))
            {
                File.Delete(Server.MapPath(imgPath));
            }

            sql_obj.DetailDelete(Convert.ToInt32(id));
        }