Using different version of assemblies (Microsoft.ReportViewer.WebForms)

Hi Guys, 

I need to use different versions of Microsoft.ReportViewer.WebForms(Version=9.0.0.0 and Version = 10.0.0.0) in a web application. Developed two user controls, one for each version of the report viewer. and loading it dynamically. But confused about the entries in the web.config. How do I define the handlers for both? ( using classic mode)

Thanks,

nasayoo

nasayoo