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Asked: 2026-05-17T22:03:09+00:00

I have following code structure, where i am trying to change the css file

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I have following code structure, where i am trying to change the css file href during runtime. I also have the Update Panel, Script Manager in the page.

It looks like that CSS file is not getting changed/loaded by the browser. I am not able to understand why? 

<head>
<link runat="server" id="link1" type="text/css" href="TOBE SET ON RUNTIME.CSS"/>
</head>

//Code to change the stylesheet on page load
    link1.Attributes["href"] = GetCSSFileName(this.UserId);

Thanks

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1 Answer

  1. Editorial Team

    Change your head section to have ID and RUNAT=”server” attribues

    <head id="Head1" runat="server">
   <link runat="server" id="link1" type="text/css" href="TOBE SET ON RUNTIME.CSS"/>
</head>

    You can set CSS stylesheet from codebehind like this

    link1.Attributes.Add("href", "mycustomstyle.css");
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