BackImageUrl in ASP Panel

I am trying to set a pdf as a background image in a panel, but nothing shows in the panel when I run the webpage.

Here is my HTML.
<asp:Panel ID="pnlInvite" runat="server" 
         BackImageUrl="~/invites/Simcor Mountains MEI Version.pdf" 
         Height="99px" >
                <td style="width: 225px" >
                    <asp:Label ID="lblSpeaker" runat="server" Text='Featuring Guest Lecturer:' CssClass="lblSpeaker" />

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IronhoofsConnect With a Mentor Commented:
I think you can't set a PDF file as background. Try a .JPG, .GIF or .PNG file.
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