asp:chart is not available on visual web developer 2008 express edition

I just installed microsoft chart controls software on my system. Now the chart is present on the data toolbox on visual C# 2008 开发者_C百科express edition. But it is not available on visual web developer 2008 express edition

When I tried

<asp:chart >

it is not available...

Do I have to do some procedure to get it active on web developer.

Can anyone tell me what is the problem...

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I added the below said to the web.config, The is available but I am getting an error..

The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Web.UI' (are you missing an assembly reference?)

What should I do now...

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Do you reference it in your web.config

• under the controls tag (path: "< system.web>") :

  < add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

• under "< httphandlers>") :

  < add path="ChartImg.axd" verb="GET,HEAD" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>