I write it in aspx like this:
<link type="text/css" href='/theme<%=theme%>/top.css' rel="stylesheet" />
but result is this:
<link type="text/css" href="/theme<%=theme%>/top.css" rel="stylesheet" />
surprising is that using in js is no problem.
You can’t use expressions with
<head runat="server">instead you have to write following code in Page_Load event to insert<link/>