vb.net halt statup in application events

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I'm trying to halt startup of an application in the application events. If I put e.cancel in the startup event, that does the trick but only sort of. The main form still flashes into view for a few milliseconds. How can I stop it from starting entirely? The need for this has to do with licensing. If it's not a valid license, I'm showing a licensing form and then I want to cancel the rest of startup. Don't want anything else to occur. I have an OnInitialize event where I'm doing some other startup things but I can't figure out how to halt startup in there.

Thanks.

Posted 30-Apr-11 16:27pm

avianrand

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DaveAuld · Answer 1 · 2011-04-30T20:07:00

Sounds like you have the main form as the startup up form.

Options;
1) Use another form e.g. a Licensing form as the startup form and only if the licensing is satisfied load the main form
2) Start the application using a Sub Main
3) Set the main forms default visibility to hidden

Personally i would rewrite the startup and licensing check to perform this in a standalone form, this way if the license is invalid it shows an appropriate message to the user to give them an idea of the issue.

OriginalGriff · Answer 2 · 2011-04-30T20:21:00

Solution 2

Handle the Form Load event, and if the validation fails use Close:

VB

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If (Not IsValid()) Then
        Close()
    End If
End Sub

Posted 30-Apr-11 20:21pm

OriginalGriff