Как отобразить все изображения из SQL с одинаковым заголовком В gridview?

---

I have a gridview:

<asp:GridView ID="GridView1" CssClass="gridview" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnRowDataBound="RowDataBound" Width="100%"  GridLines="None" SelectedRowStyle-BackColor="#a8c066" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
        <columns>
            <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" ReadOnly="True" Visible="false" />       
            <asp:BoundField DataField="Titel" HeaderText="Titel" SortExpression="Titel" />
            <asp:BoundField DataField="Path" HeaderText="Path" SortExpression="Path" />        
            <asp:BoundField DataField="extension" HeaderText="extension" SortExpression="extension" ItemStyle-CssClass="hide" HeaderStyle-CssClass="hide" />
            <asp:BoundField DataField="ContentType" HeaderText="ContentType" SortExpression="ContentType" ItemStyle-CssClass="hide" HeaderStyle-CssClass="hide" /> 
         

<SelectedRowStyle BackColor="#A8C066"></SelectedRowStyle>

there are many Pictures in SQL with the same title. I want that if you select a row and click on it, it will Show all the Images matching to the title of the selected row.
I tried this: 

Что я уже пробовал:

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
          {
              GridView listBox = sender as GridView;
              int selectedID =  Int32.Parse(listBox.SelectedDataKey.Value.ToString()); // this works!
              string titel = listBox.SelectedRow.Cells[1].Text;
              LoadDetail(selectedID, titel);
          }

           void LoadDetail(int id, string titel)
           {
               Users users = (from x in myEnt.Schwarzes_Brett where (x.ID == id) && (x.Titel == titel) select x).FirstOrDefault();

             lbltitle.Text = users.title;
             Img1.ImageUrl = "data:Image/jpg;base64," + Convert.ToBase64String((byte[])sb.FileContent);
           }

затем я нажимаю на него, он просто показывает одну картинку, но в SQL есть 4 картинки, сохраненные с тем же названием....

---