The ConnectBufferString property is readonly. Are you doing

IF oRpt.HasSavedData
  oRpt.DiscardSavedData()
ENDIF

>Hello Craig,
>
>I asked a question some days ago but didn't get answers. This is about changing the datasource at runtime for a Crystal report.
>
>More details.
>
>We design a report based on a stored procedure which is stored in a given server and database, say Test_Server and Test_Database. It runs fine from development environment, but of course I would need to run the report on production on a different server and database without having to re-edit and change the report specifications. I need to do it by just changing de DSN file the .rpt is referring to.
>
>What properties or what code do I have to implement? I have tried for example:
>
>

>oCProps.Add("FILEDSN", MyDSNFile)
>
>loRPT.Database.Tables(n).ConnectBufferString= 'FILEDSN=H:\MyDSNFile)
>

>
>and so on, but nothing seems to work. The report still tries to find the development database, and if we rename it , we get errors like "Failed to open rowset" ,
>
>
>I also applied an update named CR90MAINWIN_EN_200603 without success.
>
>
>Please some ideas,
>
>Thanks
>
>Juan C.