title: Pass jQuery Variable into ASP.NET Code Behind Using HiddenField
body: <p>I'm experiencing problems passing the physical size of a div (height and width) into an ASP.NET variable using a hidden field and jQuery.</p>
  
  <p>This is my code, but it is not working:</p>
  
  <pre><code>$("&lt;%=hfAdvertHeight.ClientID %&gt;").val($("#Advert_Container").attr("height"));
  </code></pre>
  
  <p>Any ideas?</p>
  
  <p>Many thanks.</p>