Microsoft chart control is not rendering the images when we set the managed pipeline mode to classic in IIS 7.5for the respective application pool & asp.net framework 4.0

Does anybody experience this issue i.e., when we set the managed pipeline mode to classic in IIS 7.5 Microsoft chart control is not rendering its image and at the same time it is not giving any runtime issues as well instead it is displaying the blank image does anybody know how to fix it?
My web.config settings are as follows
Appsettings
<add key="ChartImageHandler" value="storage=memory;deleteAfterServicing=true;timeout=20;"/>
 
My system web handler is
 
<system.web>
<httpHandlers>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false" />
</httpHandlers>
</system.web>
 
My system web server handler is
<s ...