Get rid of Crystal Report generated files in temp folder - Visual Studio 2008

Question

Hi I have pasted below a piece of code where I am displaying a report. I am using Visual Studio 2008 Crystal Report engine. It works all good with the piece of code

Problem: Everytime a report is being run it generates a ('.*tmp', '.*rpt') files typically in a temp folder c:\windows\temp however we can get rid of the *.tmp files by setting a recycle on the application pool but need a way to get rid of the .rpt files.

Found solution: Call Close() and Dispose() on the report object. The way I am doing is crReportDoc.Close() then crReportDoc.Dispose()

Actual Problem: If Dispose() is called the report comes up with the following error 'Object reference not set to an instance of an object'

I will really appreciate if one of the fellow mates can help me with a solution as I am quite new to programming.

Thanks

        Dim crReportDoc = New CrystalDecisions.CrystalReports.Engine.ReportDocument           
        crReportDoc = Session("ReportDocument")
        ReportViewer.DisplayToolbar = True
        ReportViewer.EnableDrillDown = True
        ReportViewer.DisplayGroupTree = False
        ReportViewer.Visible = True
        ReportViewer.DisplayToolbar = True
        ReportViewer.ReportSource = crReportDoc

Answer 1

Some times even though you call dispose on your ReportDocument object followed by GC.Collect() still the .rpt files in Temp folder are not cleaned up. And there is a limit to no. of .rpt files in a Temp folder after which CR stops executing further report requests.

Strangely this happens when you declare your ReportDocument object in side a function or event handler.

But if you declare your ReportDocument in a Page wide global Context then crystal reports happily cleans of temp .rpt files when you call the Dispose method in the Page_Unload() event !!!!