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Asked: 2026-06-09T12:06:21+00:00

When i was converting VB to VB.NET, i found the error InvalidActiveXStateException . My

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When i was converting VB to VB.NET, i found the error InvalidActiveXStateException.
My program ahs a main form and many sub forms, and while I am checking the sub forms, one of them has this error and can not open that form, but the other forms can be opened correctly.
The code is the same. Why i can not open that form?

I had been researched from internet and most of people said that :

((System.ComponentModel.ISupportInitialize)(this.ax)).BeginInit();

this.Controls.Add(ax);

((System.ComponentModel.ISupportInitialize)(this.ax)).EndInit();

but it seem C# not VB.NET and i dont know when can i found the name of ax in my program.
here is part of my program code.

Public Sub mnu_dceedc_enq_Click(ByVal eventSender As System.Object, ByVal eventArgs        As System.EventArgs) Handles mnu_dceedc_enq.Click
    If bolCheckSecurity("dcs_eedc_enq") Then
        Unload_frm()
        DCformfun = mnu_dceedc_enq.Name
        frmDCEEDC.Show()
    End If
End Sub

Private Sub chkfiltercase_CheckStateChanged(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles chkfiltercase.CheckStateChanged
    '20090401
    'fgdetail_Click

    Call ShowFolderDetail(fgdetail.get_TextMatrix(fgdetail.Row, 1), fgdetail.get_TextMatrix(fgdetail.Row, 2), CShort(txtbatchno.Text))
End Sub

When I open a sub form, it will start from nu_dceedc_enq_Click and then go to chkfiltercase_CheckStateChanged but when ran into Call ShowFolderDetail, it auto returns back to form.show() and the exception occurs.

Why does this error occur and how can I solve it?

Update after testing:

I tried commenting all the Sub chkfiltercase_CheckStateChanged and the form occur success and I am try to test whether it will occur others or not.

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1 Answer

  1. Editorial Team

    Part of what the standard conversion/usage of active x controls does is create a state for the control. This state is not always set/created correctly and will sometimes get changed when you run the application in the debugger. When the state is invalid, this exception is thrown. I generally try to replace the active x control with a .net control (either one that already exists or creating an equivalent).

    Supposedly some of the commercal alternatives to the standard tool will avoid this problem.

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