How to refresh CR 2008 datasource

Hello,
We have upgraded CR 10 that came with the Visual Studio 2005 to CR 2008. However, just upgrading of the Visual Studio project was not enough, to make old CR 10 reports to work I have to open each report in the CR 2008 application (not the Visual Studio), refresh their data source and save, after this they work.
I'm using datasets as a datasource, so I don't have problem with it. But some reports I inherited from the previous developer. He was using a C# class as a datasource for reports. It's just a C# class file - InvReport.cs. This file contains field definitions for several reports.
I cannot figure out how to refresh this datasource. Class file is not in the list of the datasources for Crystal Reports, so whatever I'm trying to do in the Database Expert (or by setting datasource location) fails.
Could you please advise me on how to deal with this situation? Or perhaps there is another way to to upgrade the old reports to 2008 version? According to Visual Studio - they all had been upgraded automatically, but in reality they don't work until I open each one in the report application and refresh datasource.
Thank you,
Peter Afonin

Peter,
Rather than updating the reports from VS2005 I would suggest you to use CR2008 designer. During updating of the application the reports might not have got updated properly as it depends on the complexity of the reports like stored procedures, formulas etc. So I would suggest you open the .rpt file in designer, Go to Field Explorer -> set data source location and then create a new connection in Replace with window and update the fields in Current datasource window.
Preview to ensure the report displays proper data and then use this report in the application.
Hope that helps!
AG.

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