Crystal Reportviewer Object Not Disposing properly

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VB

CrystalReports

Crystal Report viewer Object Not Disposing properly

Hello guys i have one problem i have one crystal report and using vb.net.

I write code where as below

For i=0 to 15 

Try

    Dim vRep As New CrystalDecisions.CrystalReports.Engine.ReportDocument
    vrep.export()


Catch


Finally 

      vrep.close()
      vrep.dispose()

end try

NEXT

Problem occurs when vrep.export raise exception then in next loop step i want be able to dispose vrep.close()
and vrep.dispose()