C#的 map流量

/*在页面定义图片*/

 <asp:ImageMap ID="Img_jiapu" runat="server">        </asp:ImageMap>

/*在后台添加热点属性*/

        public void getredian(int map_t,int map_l,int map_b,int map_r,string map_u,string map_n) {            RectangleHotSpot sd = new RectangleHotSpot();            sd.Top = map_t;            sd.Left = map_l;            sd.Bottom = map_b;            sd.Right = map_r;            sd.HotSpotMode = HotSpotMode.NotSet;            sd.NavigateUrl = map_u;            sd.PostBackValue =map_n;            Img_jiapu.HotSpots.Add(sd);        }