Hi, evreryone:
When I use VS 2012 to create report with reportviwer 11.0, I meet a problem aboutMultiple report viewers on one page. But when we use reportviwer 9.0 ，It is Ok.
It is the second report doesn't display. It prompt an error like the picture below.
I solve this problem by setting the AsyncRendering property of ReportViewer false . It works Ok. Maybe it will help you in the future .
You can also see it on msdn social:Multiple report viewers on one page issue. I answer the issue.
Thank you .
