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Editorial Team
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Asked: 2026-05-15T19:52:18+00:00

I have multiple pages that have this pattern: <iframe frameborder =0 src=[someURL] width=100% height=900>

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I have multiple pages that have this pattern:

<iframe frameborder ="0" src="[someURL]" width="100%" height="900">
</iframe>

I want to factor out everything but the URL into a master page so I tried this:

Master Page:

<iframe frameborder ="0" src=<asp:ContentPlaceHolder ID="Url" runat="server" /> width="100%" height="900">
</iframe>

Child Page:

<asp:Content ID="Content2" ContentPlaceHolderID="Url" runat="server">
    "http://myURL"
</asp:Content>

but it doesn’t seem to work. I get this error:

Cannot find ContentPlaceHolder ‘Url’ in the master page

Do I have some syntax error above?

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1 Answer

  1. Editorial Team

    It sounds like you want to re-use a snippet such that the View can dictate what the URL of the iFrame is, and the Master holds the actual iFrame.

    Consider this potential solution:

    The URL is put into ViewData from the Controller. Convention is that Views are dumb. So you could put this iFrame into your Master:

    <iframe frameborder ="0" src="<%=ViewData["yourURL"] %>" width="100%" height="900"></iframe>

    This requires that your Controller knows, or can find, the URL for the View that’s being requested. You could hard-code this right in your Controller method, or pull it from the web.config.

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