title: Changing stylesheet in code behind on masterpage
body: <p>In maste page i set the stylesheet that defines the layout.</p>
  
  <pre><code> &lt;link id="layoutStylesheet" href="CSS/Layout3Col.css" rel="stylesheet" type="text/css" runat="server" /&gt;
  </code></pre>
  
  <p>I have a ShowDoc.aspx page that inherits the master page.<br>
  I want to load a different css file when a specific parameter is passed to ShowDoc.aspx   in query string.</p>
  
  <p>How can I do it?<br>
  Should I define a public property in the master page so that showDoc.aspx can access it and change the layoutStylesheet ?</p>