Show form in VB.net

Hi,

 I have two problems when I show forms in VB.net

------------------------------------> Problem (1) <---------------------------

If I write:

//
Dim Frm as new Form1
Frm.Show
//

fhe form show and after less then 1 second unload automatically.

I don't want that the form unload itself.

form1 is a normal form without any particular properties changed.

No other objects inside and no code.

Simply add new form .. not other.


-------------------------------- Problem (2) -----------------------

If I add this code inside the load event of form:

Dim a As Byte
Dim B As Byte
 
B = 200
a = (10 + 100) + B
 
Msgbox "Test"

The compiler don't show any errors (in this case overflow) and exit to the load event.

In short: don't show the msgbox and don't show any errors.

If I write the some code in the 'main sub' the compiler show the error normally.

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

I'am new in VB.net and probably the reason is very simply but not for me ...

Someone can help me to solve these 2 problems ??

Best Regards
luca345Asked:
Who is Participating?
 
Mike TomlinsonConnect With a Mentor Middle School Assistant TeacherCommented:
You can use the Application Startup() event instead:
http://msdn.microsoft.com/en-us/library/w3xx6ewx(VS.80).aspx

In Project --> Properties, set the "Startup Object" to your main FORM.
Next, click on the Button labeled "View Application Events" in the bottom right.
In the left dropdown at the top, change it from "(General)" to "(MyApplication Events)".
In the right dropdown at the top, select "Startup".  This will add the following code:

        Private Sub MyApplication_Startup(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup

        End Sub

You can put code that was in Main() in that method stub.
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SAMIR BHOGAYTAFreelancer and IT ConsultantCommented:
Hello, you don't need to create object of a form in vb.net it is require in C# only. So, you write the below code

Form1.show()
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luca345Author Commented:
//
Hello, you don't need to create object of a form in vb.net it is require in C# only. So, you write the below code

Form1.show()
//

It is false already tested yesterday becouse form1 is a class.

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prakharsaxenaCommented:
It sounds silly but are you sure you are pointing to the correct form? Try to put a break point in the form and see if your code hits it.
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luca345Author Commented:
Already do it, the break point exit to load event and go to activated event ...

The problem are 2:

1) The forms unload automatically.
2) No errors return inside the forms.

I don't known how I can solve ....
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Mike TomlinsonMiddle School Assistant TeacherCommented:
What version VB.Net are you working in?

For problem #1, are you by chance showing new form and then closing the original form that was already open?  If so, is the original form the "startup object" in Project --> Properties?

For problem #2, are by chance working on an x64 machine?
http://connect.microsoft.com/VisualStudio/feedback/details/357311/silent-exceptions-on-x64-development-machines
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luca345Author Commented:
Hi Idle_Mind ,

Compiler: Vb.NET 2010 (setting x86)
OS: Win 7 (64 bit)

here some update:

I have downloaded from planet source code some example project of previous version VB.net.

Result: all work.

I think the problem is same setting of compiler options.

please help me !!
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Mike TomlinsonMiddle School Assistant TeacherCommented:
So the exception in Form Load() problem supposedly can be remedied by a HotFix:
http://support.microsoft.com/kb/976038/en-us
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Mike TomlinsonMiddle School Assistant TeacherCommented:
For the Show() issue, please describe the flow of the program and share all of the code.
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luca345Author Commented:
I have undestand where there is the problems.

In short to use form I must create project template 'application form'

If I use 'application console' with main function there are all of this problem.

In VB.net I can't start with sub main if I want use a form .... in VB6 I have only start with sub main.

Do you have informations about this problem ??

I need to use form and I need to start with main function ... please help me !!
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Again, what version VB.Net are you working in?

Why do you "need" to start with Main()?...there are other approaches and entry points that can be used that allow you to get the same end result as using Main() without actually starting with Main().

No, you shouldn't use a Console project if you want to work with Forms.
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luca345Author Commented:
Vb.NET 2010 4.0.30.319 is the version

I have re-open the original project and in the load event of the form don't show the error ..

Can you please halp me about the stardard /  common use of vb.net with forms ??

I have 15 Years of vb6 experience but zero experience in vb.net .
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Mike TomlinsonMiddle School Assistant TeacherCommented:
I quick fix is to move the code from the Load() event to the Shown() event instead.
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luca345Author Commented:
Idle_Mind:

Your solution seem work.

In the shown() event the compiler show the error.

At this point I can't use the load event becouse don't show any errors ... and this is can be very dangerous !!

For your opinion how I can simulate the 'main' sub ?
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Mike TomlinsonMiddle School Assistant TeacherCommented:
What are you doing in Main()?...
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luca345Author Commented:
In all my project I always use the main to:

Initialize the global variable.
load the config file.
initialize the colors of the custom graph interface.
load the form of demo version (days left)
open the connection of database
......
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luca345Author Commented:
Idle_Mind:

Thanks this is what I need !
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luca345Author Commented:
Very good !
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luca345Author Commented:
Idle_Mind:

I have multiple questions (3/4)  to ask all of this are vb6 to vb.net problem conversion.

Can you help me ?
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Mike TomlinsonMiddle School Assistant TeacherCommented:
You can ask here but no one else will see them since the question is closed.  If I can't help you then make a new question.
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luca345Author Commented:
Idle_Mind:

here my next question:

http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_27290878.html

can you loot it please ?
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