MS Chart Control in ASP.net 4.0 Error

After Creating Webapplication in VS 2010 and using Chart control you will Receive Following Errors Unknown server tag 'asp:chart'. 
Visual Studio 2010 with .NET 4.0 not recognising System.Web.UI.DataVisualization.Charting

to Remove this error  you need to make few changes in Web,config
Step 1:
Find the <system.web> Section in Web,config and make changes in 3 sections given below

<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>
<pages>
 <controls> <add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> </controls>
 </pages>
 <compilation debug="true" targetFramework="4.0">
 <assemblies> <add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </assemblies>
 </compilation>

Step 2: 
After This Find section <system.webServer>

and replace or merge with following contents

<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<handlers>
<remove name="ChartImageHandler"/>
<add name="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD,POST" path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</handlers>
</system.webServer>

Step 3:
Add Reference for  System.Web.DataVisualization.dll