1455376 - How to launch reports on two separate threads

Not able to launch two reports from one application at the same time

Using CrystalReportsDocument.Load or any other Crystal Reports APIs for .NET to launch a report is a sequential process

• Use two separate threads

Public Class Form1
 
    Private rpt1 As ReportDocument
    Private rpt2 As ReportDocument
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim viewer As CrystalDecisions.Windows.Forms.CrystalReportViewer
 
        ' pre-load reports 1 and 2
        rpt1 = New ReportDocument
        rpt2 = New ReportDocument
        rpt1.Load(Application.StartupPath & "\report1.rpt", CrystalDecisions.Shared.OpenReportMethod.OpenReportByTempCopy)
        rpt2.Load(Application.StartupPath & "\report2.rpt", CrystalDecisions.Shared.OpenReportMethod.OpenReportByTempCopy)
 
        viewer = New CrystalDecisions.Windows.Forms.CrystalReportViewer()
        viewer.ReportSource = rpt1
        viewer.ShowLastPage()
        rpt1 = viewer.ReportSource
 
        viewer.ReportSource = rpt2
        viewer.ShowLastPage()
        rpt2 = viewer.ReportSource
 
        viewer.Dispose()
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim t As Thread
 
        t = New Thread(AddressOf PrintRpt1)
        t.Start()
    End Sub
 
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim t As Thread
 
        t = New Thread(AddressOf PrintRpt2)
        t.Start()
    End Sub
 
    Private Sub PrintRpt1()
        ' print report 1
        rpt1.PrintToPrinter(1, True, 0, 0)
    End Sub
 
    Private Sub PrintRpt2()
        ' print report 2
        rpt2.PrintToPrinter(1, True, 0, 0)
    End Sub
End Class

• Note: his solution was provided in the .NET Development - Crystal Reports forum and has not been tested by SAP technical support

Forum thread , KBA , BI-DEV-NET-SDK , .NET SDK / COM SDK , How To