Differences between CrystalReportViewer1.Refresh VS ReportDocument1.refresh

Hi,
I have an Interop App that is called from a COM program.
In my application I have a COM Class and a windows form
In my Class I have a reference to the windows form objects:
Dim document As CrystalDecisions.CrystalReports.Engine.ReportDocument = formeRapport.myDocument
Dim visualiseur As CrystalDecisions.Windows.Forms.CrystalReportViewer = formeRapport.CrystalReportViewer1
I make the link between them with
visualiseur.ReportSource = document
When I want to refresh the report
Do I have to refresh the document, the visualiseur or both, or what is the difference?
Visual Basic 2008 Visual Studio Team System 2008 V 3.5 sp1
Crystal Reports 2008 V 12.0.0.683
Thanks in advance.

ReportDocument uses the print engine APIs, CrystalReportViewer uses the viewer APIs. Viewer APis are simple and not as fully featured as the engine APIs. For example using the viewer APIs you can not change the datasource, but using ReportDocument you can change to a different datasource.
BTW., highly recommend that you apply SP3:
https://smpdl.sap-ag.de/~sapidp/012002523100007123572010E/cr2008_sp3.exe
Runtimes:
https://smpdl.sap-ag.de/~sapidp/012002523100007123592010E/cr2008sp3_redist.zip
https://smpdl.sap-ag.de/~sapidp/012002523100007123582010E/cr2008sp3_mm.zip
https://smpdl.sap-ag.de/~sapidp/012002523100007129722010E/cr2008sp3_clickonce.zip
- Ludek

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Differences between CrystalReportViewer1.Refresh VS ReportDocument1.refresh

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