Setting a form = nothing

[Ingo]

I have two forms: MDIForm and ChildForm.

To open the child form from the MDI I do:

Dim f As frmChildForm
If IsNothing(f) Then
f = New frmChildForm()
f.MdiParent = Me
End If
f.Show()

where f is a module variable.

But if I close the ChildForm whith Me.Close and then I try to open it
again, I get problem, because f si not Nothing.
From the other site, I cannot remove the IF...THEN that avoids two
instances of the same form.

Any suggestion?

Thank you.

[Mattias Sjögren]

Ingo,

>Any suggestion?

If IsNothing(r) OrElse f.IsDisposed Then ...



Mattias

===
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.

[Bruce]

"Ingo" <ingo_na@hotmail.com> wrote:
>I have two forms: MDIForm and ChildForm.
>
>To open the child form from the MDI I do:
>
>Dim f As frmChildForm
> If IsNothing(f) Then
> f = New frmChildForm()
> f.MdiParent = Me
> End If
> f.Show()
>
>where f is a module variable.
>
>But if I close the ChildForm whith Me.Close and then I try to open it
>again, I get problem, because f si not Nothing.
>From the other site, I cannot remove the IF...THEN that avoids two
>instances of the same form.
>
>Any suggestion?
>
>Thank you.
>
Try this:
If IsNothing(f) Then
f = New frmChildForm()
f.MdiParent = Me
f.Show()
ElseIf not f.visible then
f = New frmChildForm()
f.MdiParent = Me
f.Show()

End If


>

[Michael Culley]

I've never tried this but this was one idea I came up with for this
situation

Create a public static variable on frmChild called SingleInstance (or
whatever you like)
When the form loads set Me to SingleInstance
When it closes set SingleInstance to nothing
When starting the form check if frmChild.SingleInstance is nothing.

--
Michael Culley