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Editorial Team
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Asked: 2026-05-14T05:34:20+00:00

I am trying to redirect a page reading the url from the config file.

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I am trying to redirect a page reading the url from the config file.

However, when I try this:

   <script type="text/javascript">
<%string redirectUrl = System.Web.Configuration.WebConfigurationManager.AppSettings["RedirectURL"];%>
    window.parent.location.replace("<%=redirectUrl%>");
</script>

the alligator tags <% %> are Not being highlighted, and when I run I get the following error in the yellow screen:

the controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).

What am I doing wrong??

Thanks!

Edit:

It does work if I just put the url straight into the code, as in 

window.parent.location.replace("http://theurl.com");

but I need to change this depending on other things, so I need it to be in the config :S

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1 Answer

  1. Editorial Team

    You’re probably including the block inside a 

    <head runat="server"> ... </head>

    block. If you want to use <% %> blocks you need to remove the runat=”server” from the head tag but then you’ll lose the Page.Title and some other features.

    In your particular case, doing

    window.parent.location.replace("<%= System.Web.Configuration.WebConfigurationManager.AppSettings["RedirectURL"] %>");

    should fix the problem, i.e. get rid of the <% %> tags.

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