BACKGROUND PROCESSING, REPORT NOT LOADING, "OBJECT NOT SET TO INSTANCE..."

Question

Post Author: thecoffeemachine
CA Forum: .NET
I already posted this message in other Web sites, but I am almost getting crazy here and I need help:
HI:
The Web application I am testing was having several issues related to loading Crystal Reports. It was fixed and I do not know which of the 1000 things I did to fix it; but now it began, again, to have the same behavior after I had a conflict with another Web site that was in the same server.
The thing is that I had another virtual directory where resided a copy of the same Web app. for testing purposes/working with the Visual Studio. The reports were loading all fine, very fast, all perfect... And suddenly the assemblies of one Web site and the other began to "blend" together and..... well the same behaviors appeared again. I tried to copy the last stable backup and rebuild the Web app... but it did not work.
At the very first time that one requests the report, it shows without problem. At the second time it shows an error message related to "cannot submit to background processing", and sometimes "object not set to an instance.." ... and on the third time it just never shows up and the app. becomes unresponsive. I have to close the window and request the Web site again in another browser window. If I wish to see the report again I have to wait for hours until it shows it.
I am using Visual Studio 2003 and the Crystal Report version that was shipped with that Visual Studio version. I am working with Windows Server 2003 and SQL Server 2000. Below is the VB code:
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load             Me.SqlConnection1.Open()
       Me.SqlSelectCommand1.Parameters("@CourseCode").Value = Request.QueryString("CD")         Me.SqlSelectCommandReferences.Parameters("@CourseCode").Value = Request.QueryString("CD")         Me.SqlSelectCommandTextbook.Parameters("@CourseCode").Value = Request.QueryString("CD")         Me.SqlSelectCommandObjectives.Parameters("@CourseCode").Value = Request.QueryString("CD")         Me.SqlSelectCommandTopicData.Parameters("@CourseCode").Value = Request.QueryString("CD") Me.SqlSelectCommandCourseOutcomes.Parameters("@CourseCode").Value = Request.QueryString("CD")
        Me.SqlDataAdapterMainData.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseSyllabusData")         Me.SqlDataAdapterReferences.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseReferenceData")         Me.SqlDataAdapterTextBook.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseTextbookData")         Me.SqlDataAdapterObjectives.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseObjectivesData")         Me.SqlDataAdapterTopicData.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseTopicData")
Me.SqlDataAdapterCourseOutcomes.Fill(Me.DtsSyllabusCompleteData1, "procWebSelectCourseOutcomes")
        Dim myExportOptions As CrystalDecisions.Shared.ExportOptions         Dim myDiskFileOptions As CrystalDecisions.Shared.DiskFileDestinationOptions         Dim myExportFile As String         Dim myReport As New ABETFormat         myReport.SetDataSource(Me.DtsSyllabusCompleteData1)
        myExportFile = "C:UNTempPDF" & Session.SessionID.ToString & ".pdf"         myDiskFileOptions = New CrystalDecisions.Shared.DiskFileDestinationOptions         myDiskFileOptions.DiskFileName = myExportFile         myExportOptions = myReport.ExportOptions
        With myExportOptions             .DestinationOptions = myDiskFileOptions             .ExportDestinationType = .ExportDestinationType.DiskFile             .ExportFormatType = .ExportFormatType.PortableDocFormat         End With
        myReport.Export()
        Response.ClearContent()         Response.ClearHeaders()         Response.ContentType = "application/pdf"
        Response.WriteFile(myExportFile)         Response.Flush()         Response.Close()         System.IO.File.Delete(myExportFile)         Me.SqlConnection1.Close()
    End Sub
I already have tried moving the Crystal Reports dll´s to the bin directory. ..... I have tried calling the Garbage Collector at page unload...I also have checked, inside the report, that the database is "up to date"... ... recycling the worker process of the IIS... etc...
I see that, in debbuging mode inside the Visual Studio, when the page loads the debbuging window shows a message notifying that the symbols related to the Crystal Reports dll's could not be loaded.
Should I need to modify the default properties of the database? I checked "database is case insensitive", "use indexes or server for speed".. I have tried checking and unchecking the box "performing grouping on server"
Oh by the way, my report has about 4 subreports in it. Each report loaded shows 1 or 2 pages.
ANY HELP WILL BE EXTREMELY APPRECIATED....
MMS

Answer 1

See  [Crystal Reports For Visual Studio 2005 Walkthroughs|https://www.sdn.sap.com/irj/boc/index?rid=/library/uuid/2081b4d9-6864-2b10-f49d-918baefc7a23&overridelayout=true] article, page 107 and on for details on how to use Crystal reports in session.
Ludek