< link rel = "Stylesheet" media = "screen" type = "text/css" href = "< % = ResolveUrl ("~/userControls/UIControls/Switch/switch.css") % > " />
Quelle: http://geekswithblogs.net/renso/archive/2010/11/24/loading-css-stylesheet-for-ascx-asp.net-user-control.aspx