ImageUrl correct but image not showing in Gridview

Question

My Database

Advertise.aspx

<asp:TemplateField HeaderText="Hình ?nh">
       <ItemTemplate>
               <asp:Image ID="imgHinhanh" ImageUrl='<%#Eval("adv_Url") %>' runat="server"></asp:Image>
      </ItemTemplate>
</asp:TemplateField>

Advertise.apsx.cs

        public void BindGrid() {
            grdAdver.DataSource = AdvertiseService.adv.Adver_GetAll();
            grdAdver.DataBind();
        }

AdvertiseService.cs

        public List<AdvertiseInfo> Adver_GetAll()
        {
            return adv.Adver_GetAll();
        }

AdvertiseInfo.cs

    public partial class AdvertiseInfo
    {
        public int adv_id { get; set; }
        public string adv_Name { get; set; }
        public string adv_Url { get; set; }
        public int? adv_Width { get; set; }
        public int? adv_Height { get; set; }
        public string adv_Link { get; set; }
        public int? adv_Target { get; set; }
        public int? adv_Position { get; set; }
        public int? adv_Order { get; set; }
        public int? adv_Status { get; set; }
    }

 Please help me. I wasted long time to fix but i can't. Thanks anyone.