.Net MVC删除图片

还在学校，菜鸟级别，接触到的只是 

  /// <summary>
        /// 根据imageID删除图片
        /// </summary>
        /// <returns></returns>
        public int deleteImage(image im)
        {
            return new InfoService().deleteImage(im);
        }

DAL = > BLL => UI

   /// <summary>
        /// 根据ImgID删除图片
        /// </summary>
        /// <param name="imgID"></param>
        /// <returns></returns>
        public JsonResult delImg(string imgID)
        {
            img.imageID = Convert.ToInt32(imgID);
            int result = im.deleteImage(img);
            JsonResult json = new JsonResult();
            if (result > 0)
            {
                json.Data = new { data = "Success" };
                json.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            }
            else
            {

                json.Data = new { data = "Failed" };
                json.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            }
            return json;
        }

 $(".btnDel").click(function () {
                var imgID=$(this).data('del');
                //询问框
                layer.confirm('您确定删除吗？', {
                    btn: ['确定', '取消'] //按钮
                }, function () {
                    $.ajax({
                        url: '/Info/delImg',
                        type: "get",
                        data: {
                            imgID:imgID
                        },
                        success: function (data) {
                            if (data.data == "Success") {
                                layer.msg('删除成功', { icon: 1 });
                            }
                        }, error: function (data) {
                            layer.msg('删除失败', { icon: 2 });
                        }
                    })
                    //layer.msg('删除按钮被点击', { icon: 1 });
                    //去删除
                }, function () {
                    layer.msg('取消按钮被点击', {
                        time: 20000, //20s后自动关闭
                        btn: ['明白了', '知道了']
                    });
                });
            });