Cannot access a disposed object

[rockwell]

Hello all, i am getting an error when trying to access the sub form in vb.net. I created a sub form in vb.net and if i click a button its coming up by calling "subform.Show()", when i close the sub form and try to reopen it its giving me an error saying "Cannot access a disposed object sunform". I guess i am getting this error as i am not releasing the form or something . Any suggestions for this please ...

Thanks for your time ...

--kris

 

[JuggaloBrotha]

when you close a form it gets disposed so if you need to show it again you need to make a new instance by using the 'New' keyword before showing it again. ex:

Private frm As Form1

'A button or menu item's click event:
frm = New Form1
frm.Show()

in your case replace 'frm' with 'subform'

another alternative is to never close the form, just hide it
in the subform's closing event:

e.Cancel = True
Me.Hide

 

[Don Delegate]

Closing a modeless form (Show) is actually Disposing it.
You cannot use a disposed object (as you just found out): resources are freed, etc..
Just create a new instance of the form, or as an alternative hide the modeless form instead of closing it. Another possibility is showing the form modal (with ShowDialog). Closing a modal form in fact just hides the form.

Best practice in most cases (there are some exceptions) is creating a new instance. Even when using ShowDialog, but then you'll have to call Close (or Dispose) yourself.

Edit: I see JuggaloBrotha was a lot faster to hit the submit button

 

[rockwell]

Thanks for your replies its working .....