problem referencing a form

ok, I followed the direction for mimicking a global form from here:

http://msdn.microsoft.com/library/de...adingToNET.asp

I have followed the instructions to a 'T'. I created a Sub Main() in my module for my functions. I set the startup object to load sub main first.

in the sub main, I placed the code to instantiate the class just like the page said.

I get an error: object reference not set to an instance of an object
whn trying to manipulate a listview my calling it this way:

MainForm.Ticketing.tab_TrblHistory_lvwTroubleHistory.Items.Add(History(intCount).TicketNumber)


MainForm is the class, ticketing is the property and rest is the control I'm trying to add a row to.

What am I missing here?

:confused:

Dear Ninja, might you insert the code that declare and instance the form?
It should be like this, I assume:

Public FrmReg As New FrmRegistrazioni


If it's so and if your program step trough this code (put a break and verify) you should not have any problem.

Waiting for your news.....:wave:

Excuse me, Andy, I confused your nick!!!:blush:
I have seen another thread just few seconds before and my memory failed!:bigyello:

ninja IS a cool nickname!!

VB Code:

Sub main()
 
        Dim MainApp As New frmTicketingMain
        MainApp.Showdialog()
        MainForm.Ticketing = MainApp
 
    End Sub

That is where my program enters and "MainApp" is supposed to be the only form visible.

frm TicketingMain is the actual form that I created and it is the application. MainForm is the class and ticketing is the property. here is the class and property:

VB Code:

Public Class MainForm
    'Purpose    :   sets up a "global" instance of the application
    'Accepts    :   
    'Returns    :   
    'Notes      :   
 
 
    Private Shared m_MainForm As frmTicketingMain
 
 
    Public Shared Property Ticketing() As frmTicketingMain
        Get
            Return m_MainForm
        End Get
        Set(ByVal Value As frmTicketingMain)
            m_MainForm = Value
        End Set
    End Property
 
End Class

here is where I get the error:

VB Code:

MainForm.Ticketing.ListView1.Items.Add(Object1(intCount).ItsProperty)

I gave the names as you see them for clarity. :)

I have tried other things with that last statement such as writing to a text box on mainForm.ticketing or simply writing something to the console. I still get that error.
:confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused:

hmm...I have discovered this: the property "Ticketing" is equal to Nothing. That's weird cause it IS equal to the frmTicketingMain UNTIL it gets to the location I pointed out (thelistview).

what could be causing the object to lose it's property value?

Declare MainApp outside of Sub Main, like a form level module. Declare it as Public if you plan on referencing it from any form outside your module.

ok. so I Won't need sub Main then, right? that's where the program gets fired off. If I declare it outside, I'll have declared it twice: once to show the form inside form main and then once again outside.

I guess I could have the startup object as the main form? will that still work?

alright!! Here's what I did:

I took this out of sub main(): MainForm.Ticketing = MainApp

I stuck that in the formLoad event of the main form and changed MainApp to say Me.

works like it should now.

geez....8 hours almost with this stinking problem!!!

Thanks all :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: :bigyello: