Report developed in sql server 2008 . The report published in sql server 2012 report server,
it shows empty report. How i can fix this issue.
Empty how? Report header & footer show, but no data returned? Just a blank page returned?
If the report's header and footer show, I'd take a look to make sure your data source is pointing to the right environment (correct db on correct server) and then manually run the query in SSMS to see what records are returned.