Unhandled error not caught in nested form

Question

0.00/5 (No votes)

See more:

When I call a form from another form, there are no errors caught.

In my sample code the messagebox for ready is rightfully not executed because the statement is not valid, so there should be an unhandled error message, which is not given.
What is the problem here ?

VB

Public Class Form1
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Form2.Show()
        Form2.Dispose()
    End Sub
End Class

VB

Public Class Form2
    Private Sub Form2_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Dim i, j As Integer
        MsgBox("begin")
        j = 0
        i = 100 / j
        MsgBox("ready")
    End Sub
End Class

I have tested it on another PC with the sdame instance of VS2010. I used exactly the same code and here I don't have the problem. Could it be a central setting or something ?

Posted 6-Jan-13 2:03am

Wietze Bron

Updated 6-Jan-13 3:29am

v2

Add a Solution

2 solutions

Solution 2

Thanks Zoltan, you have been very helpfull.
Your suggested link was exactly what applied to my case.
The problem exists on a 64 bit Win7 system and not on the 32 bit Win7 system, which I tried later on. The workaround in the link however, is only partly usefull.

Posted 6-Jan-13 6:32am

Wietze Bron

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

**Zoltán Zörgő** · Accepted Answer · 2013-01-06T02:08:00

Solution 1

Calling Show() does not make make second form modal, thus execution continues in the _Click event. And _Load method is not the first to call during form creation. This Dispose() is called before can reach your code. Try ShowDialog() and you will get your exception.

Posted 6-Jan-13 2:08am

Zoltán Zörgő

Updated 6-Jan-13 2:09am

v2

Comments

Wietze Bron 6-Jan-13 8:16am

I am sorry, this makes no difference. The begin messagebox was
already shown in the first place, so this has nothing to do with the code
being executed or not in the form2_load.

Zoltán Zörgő 6-Jan-13 8:22am

I don't know what you have in your code, but I am getting the exception.

Wietze Bron 6-Jan-13 8:43am

Hi Zoltan, thanks for your reaction.

I just used the code plain as stated above and I get no exception.
Form2 comes up whith the first messagebox and not with the second.

When I change form2 to the following I get an exception, but there should always be an unhandled exception I think.

Private Sub Form2_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim i, j As Integer
Try
MsgBox("begin")
j = 0
i = 100 / j
MsgBox("ready")
Catch ex As Exception
Call MsgBox(ex.Message)
End Try
End Sub

Wietze Bron 6-Jan-13 9:30am

I have tested it on another PC with the sdame instance of VS2010. I used exactly the same code and here I don't have the problem. Could it be a central setting or something ?

Zoltán Zörgő 6-Jan-13 12:10pm

Catching unhandled exceptions by the IDE is a gray area. Check this, just as a chance:
http://blogs.msdn.com/b/debugger/archive/2010/05/12/visual-studio-debugger-fails-to-catch-unhandled-exception-for-a-windows-form-or-wpf-application.aspx
I suggest try running your code outside VS. Look at the system logs too.