Cannot find namespace System.Web.UI.DataVisualization.Charting
<p>I'm wanting to use the inbuilt charting thats with .net 4.  I have an existing MVC3 application, but I cannot seem to see the reference for this namespace?</p>

<p>Anybody know where it is?</p>

<p>Thanks,</p>

<p>Darren.</p>
