Resolved disposing problem

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Jul 7th, 2004, 09:38 AM
micned

Resolved disposing problem

Hello.

I'm having difficulty ending a program. When I try to end from the main form everything is fine, but if I can't get the program to properly end from a second open form. With all the ways of ending a program that I know I always get the following error:

An unhandled exception of type 'System.ObjectDisposedException' occurred in system.windows.forms.dll

Additional information: Cannot access a disposed object named "ListBox".

I don't have any objects named "ListBox." I have one listbox on the secondary form named "lbxRecentFiles," but I'm not trying to access it on exit. Any ideas?
Jul 7th, 2004, 09:41 AM
taxes
Hi,

Have you tried
VB Code:
```
Application.Exit
```
Jul 7th, 2004, 09:45 AM
micned

Wow, that was easy. Application.Exit worked. Can't believe I had so much trouble with that.

Thanks a million.
Jul 7th, 2004, 09:48 AM
taxes

Hi,

You're welcome. Sounds like you don't start your projects with

Application.Run

Don't forget to edit your first post and add "Resolved" to the thread title.
Jul 7th, 2004, 09:55 AM
micned

No I don't start with Application.Run. What is the advantage of that and what does it do? Would I just put in in the Load section of the main form?

In case you haven't noticed, I'm new to .NET. I'm just teaching myself. Thanks for your help.
Jul 7th, 2004, 11:19 AM
taxes
Quote:

Originally posted by micned
No I don't start with Application.Run. What is the advantage of that and what does it do? Would I just put in in the Load section of the main form?

In case you haven't noticed, I'm new to .NET. I'm just teaching myself. Thanks for your help.

Hi,

The cleanest way to start a project is to make Sub Main the startup object (Right click on the project name in the Solution Explorer Window; click on Properties in the drop down window that appears: make sure the General section is selected in the window on the left: select Sub Main in the Startup box: click on Apply at the bottom of the window.)

In a Module (assuming your starter form is fclsFirst)
VB Code:
```
Public frm1 as New fclsFirst
 
Public Sum Main()
  Application.Run(frm1)
End Sub
```
This removes most pitfalls when you refer to frm1 from another form.

Best of luck.