Crystal reports export

Hi,

I'm trying to export a PDF of my report to a destination on my local server, the PDF is consulted by many people in the organization. I kind of want the export process to be done automatically through code at a set time and date. The problem is sometimes I get the error "The process cannot access the file ... because it is being used by another process." This is because someone currently has the file open. Is there a way to force vb.net to overwrite the file regardless if it's open?

The code I'm currently using is
  Dim CrExportOptions As ExportOptions
        Dim CrDiskFileDestinationOptions As New DiskFileDestinationOptions()
        Dim CrFormatTypeOptions As New PdfRtfWordFormatOptions()

        CrDiskFileDestinationOptions.DiskFileName = "S:\Projects.pdf"
        CrExportOptions = cryRpt.ExportOptions
        With CrExportOptions
            .ExportDestinationType = ExportDestinationType.DiskFile
            .ExportFormatType = ExportFormatType.PortableDocFormat
            .DestinationOptions = CrDiskFileDestinationOptions
            .FormatOptions = CrFormatTypeOptions
        End With
        cryRpt.Export()

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FCapoAsked:
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lcohanDatabase AnalystCommented:
I don't think that is possible and there are multiple discussions/suggestions here: http://forums.asp.net/t/1270218.aspx?Force+File+Delete+by+Handle+Unlocking about similar thing.

This is what I would do to avoid locking:
1. generate the PDF file in a "staging" folder by using your code then copy it into the "readers" folder but with a timestamp attached to its name. This way I believe users will "open" - read the file but also see new one(s) created so they'll close it(them) as new ones get created so you could run a "cleanup" on older files than... By this you could also have a history in that "readers" folder for whetever number of days you decide.

2. you could also "email" the PDF instead to a "subscribers" list so each will get its own copy once it gets generated like here: http://vb.net-informations.com/crystal-report/vb.net_crystal_report_email.htm
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
Try to export the pdf to a private folder and then initiate a file copy operation from the private folder to the public one.
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frankhelkCommented:
Brute force attempt:

Wrap the cryRpt.Export() into a try/catch clause. When the exception (narrow it down to that speciall access denied issue) is thrown, just wait for a little time (some seconds, a minute, sth. else) and try again.

If your program needs to go forward, just start a separate thread for the export.

For a somewhat more elegant attempt, just try to delete the target file prior to writing to it. Wrap a try/catch around the delete. After deleting it, nobody can open it again before you write. If the delete attempt throws the exception access denied, just wait. If it fails with "file not found": No problem at all.
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