How to make user controls know about css classes in ASP.NET

Here's what I did:

<link rel="Stylesheet" type="text/css" href="Stylesheet.css" id="style" runat="server" visible="false" />

It fools Visual Studio into thinking you've added a stylesheet to the page but it doesn't get rendered.

Here's an even more concise way to do this with multiple references;

<% if (false) { %>
    <link rel="Stylesheet" type="text/css" href="Stylesheet.css" />
    <script type="text/javascript" src="js/jquery-1.2.6.js" />
<% } %>

As seen in this blog post from Phil Haack.

Add the style on your usercontrol and import css in it.

 <%@ Control Language="vb" AutoEventWireup="false" CodeBehind="WCReportCalendar.ascx.vb"
Inherits="Intra.WCReportCalender" %>
 <style type='text/css'>    
      @import url("path of file.css");
       // This is how i used jqueryui css
      @import url("http://code.jquery.com/ui/1.10.0/themes/base/jquery-ui.css");               

 </style>

 your html