Crystal Reports 2008 and VS 2010

Dear Experts,

I converted a Vs2003 to VS2010 solution and migrated the reports from Crystal Reports 4 to Crystal Reports 2008. When I meant migration, I opened the reports and saved them in CR 2008.

Now in .net code, I replaced a following line of code
mReport.Database.Tables(intTable).SetDataSource(rs)
where rs is ADODB recordset

with
 Report.Database.Tables(intTable).SetDataSource(rs)
here rs is dataset.

when I run the code, Im getting the following error
"Unknown Database Connector Error
Error in File Insert8x11 {FF45DD93-E337-400A-80DB-2E9529C608B9}.rpt:
Unknown Database Connector Error"

Could you please let me know what I'm missing here..

Thanks
Siva Manickam