Form Closing And Unhandled Exception

Oct 19, 2011

I am inheriting my class from a form that has a handler for FormClosing (it's overridable so I can override it and do MsgBox("Ha") there before calling the base method). In my Shared Sub New() I have:

' Add the event handler for handling UI thread exceptions to the event.
AddHandler Application.ThreadException, AddressOf Application_ThreadException
' Add the event handler for handling non-UI thread exceptions to the event.
AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf CurrentDomain_UnhandledException
'For Console applications you should use the System.AppDomain.UnhandledException event
AddHandler Thread.GetDomain().UnhandledException, AddressOf CurrentDomain_UnhandledException

If I throw an exception in my form outside of a try/catch I am noticing two different behaviors: If I am using the VS debugger I get an unhandled exception and it seems that my unhandled exception handler is called. The formClosing event handler does not seem to be called. If I am NOT using the VS debugger then the FormClosing Handler is being called but the Unhandled Exception handler isn't called. Ideally I would like (in both cases) to have the Unhandled Exception to be called and then the FormClosing event handler to be called.

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I have a simple form that when filled out with a case # will return the name of the person that is handling the case. I am getting an error on any machine that does not have VS 2010 installed on it. The error is when ever the user uses the close button (the red X) at the top right of the form the following error is generated:

System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)

[code].....

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Hi guys. Our application got this exception after it was closed... I was wondering how we can solve this...

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I have written an application but it didn't work here on my pc and unhandled expression occurred when I execute my program then this error is occurred.

"System.InvalidOperationException was unhandled
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Source="E-Photographer"
[Code] ....

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May 3, 2010

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May 8, 2012

ok so i viewed some other question that are ruffly the same and i am still confused, here is the stacktrace

at Game3.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 190
at Game3.My.MyProject.MyForms.get_Character_Creator()
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[Code]...

also, where is game3.my.myproject, obviously its a line of code but what is it in.

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Dim Process As New Process()
Dim Count As Integer = 0
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System.ComponentModel.Win32Exception was unhandled
ErrorCode=-2147467259
Message=Access is denied[code]....

As I said before, this had been working for several days, up until now.

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VS 2008 Closing All Forms When Program Closes Vs. Closing All But Main Form

Jun 4, 2010

Dim frm As Form
For Each frm In Forms
Set frm = Nothing
Next frm

The above code is what I used in VB6 to close all forms associated with my programs before my program closed. I have been searching for information on how to make sure all forms are closed when closing a VB2008 program.

I have seen info on using the Project Property Shutdown mode When startup form closes and I currently have this set.

Is this all that is really necessary? Will the garbage disposal close everything else to free up RAM?

Also, if I have several forms open and want to close all from the main form without closing each one individually, what is the best approach? Is there a collection like in VB6, go through the collection, compare it to the name of the main form and close it if it is not the main form?

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Private Sub frmTransaction_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
If ListView1.Items.Count >= 1 Then

[Code]....

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'Pankaj Pande
'IS 622
'AVL Tree Assignment

[Code]...

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[code].....

I m getting an error NullReference Exception was handled at this line of code

Dim snmp As New SimpleSnmp
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Public Class FrMain
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Public Imbuh(0 To 4, 0 To 1) As String
Public Struktur(0 To 3) As String
Public DesStruktur(0 To 3) As String
[Code] ......

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Aardvark
Because
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[Code]....

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[code]....

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[Code]...

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Quote:

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[CODE]............

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[code]....

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[code]....

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