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Listing 25.8 - VaryByCustom.aspx

Listing 25.8 - VaryByCustom.aspx (C#)
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<%@ Page Language="C#" %>
<%@ OutputCache Duration="3600" VaryByParam="none" VaryByCustom="css" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void Page_Load()
    {
        if (Request.Browser.SupportsCss)
            pnlCss.Visible = true;
        else
            pnlNotCss.Visible = true;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Vary By Custom</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:Panel
        id="pnlCss"
        Visible="false"
        Runat="server">
        <span style="font-weight:bold">Hello!</span>    
    </asp:Panel>

    <asp:Panel
        id="pnlNotCss"
        Visible="false"
        Runat="server">
        <b>Hello!</b>    
    </asp:Panel>
    
    </div>
    </form>
</body>
</html>