<%= Bundle.Css()
.Add("~/css/text.css")
.Render("~/css/combined_#.css")
%>
<%= Bundle.Css()
.Add("<%# HttpContext.Current.Application["SITE_URL_PATH"]%>/css/text.css")
.Render("~/css/combined_#.css")
%>
Currently, I am using SquishIt.Framework (vs1.0.4 NuGet package) in Asp.Net web-forms.