Error in chart control name space

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chart

ASP.NET4

Hi,

I am using .net framework 4.0. I want to use chart controls in my applications.

I have added the namespace in my web.config file.

But, still i am getting Error like "Type System.web.UI.Datavisualization.Charting" not defined in top of the aspx code.

Why this will happen...?

<system.web>
    <compilation debug="true" strict="false" explicit="true" targetFramework="4.0">
      <assemblies>
         <add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    </compilation>

<httpHandlers>
 <add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
  </httpHandlers>
</system.web>