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author's profile photo Former Member
Former Member

Problem open report


Can help me with this please:

How can I open a CrystalReportViewer in my project SDK. Because I have this problem when my applications debugins this open the Viewer with the report. But when my report is created with parameters this show this error.

activex control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment



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  • Best Answer
    author's profile photo Former Member
    Former Member
    Posted on Jun 26, 2008 at 09:39 AM

    Hi Jose,

    If you are working in .NET environment, you can try adding "[STAThread]" before main() like:


    static void Main()




    Application.Run(new Form1());


    Best Regards,


    Edited by: Jay Ji on Jun 26, 2008 11:39 AM

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 27, 2008 at 06:43 AM

    Hi Jose,

    You can write the CallingDialog function without window wrapper patch:

    Private Sub CallingDialog()

    FileDialog = New System.Windows.Forms.OpenFileDialog


    End Sub

    About your question , if you have problem with the appearance of the FileDilaog, add this class of window wrapper:

    Public Class WindowWrapper

    Implements System.Windows.Forms.IWin32Window

    Private _hwnd As IntPtr

    Public Sub New(ByVal handle As IntPtr)

    _hwnd = handle

    End Sub

    Public ReadOnly Property Handle() As System.IntPtr Implements System.Windows.Forms.IWin32Window.Handle


    Return _hwnd

    End Get

    End Property

    End Class


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    • Former Member

      Hi All,

      I have the same scenario. I have applied the code given above but to me the problem remains the same.

      For your reference I copy my code here:

      Module MainSub
          Public Sub main()
              Dim thread As Thread = New Thread(New ThreadStart(AddressOf CallingCode))
              Dim AJMReports As reports
              AJMReports = New reports()
          End Sub
          Private Sub CallingCode()
              Dim Filedialog As Printouts
              Filedialog = New Printouts
          End Sub
      End Module

      "Printouts" above is my form to show crystal reports.

      Can anybody guide me where I am doing wrong?

      Many thanks in advance for any help.

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