Open & Close forms in VB.NET

[gordonwilson]

Hi

I am new to VB.NET and basically am having problems opening and closing forms.

To open a form this is what I do:

Dim AddEntry as New Form2
AddEntry.Show

To close a form (say after a save operation):

Me.Hide
or
AddEntry.Hide

Now. Here is the tricky part. If I use the X button to close the window the next time the program tries to open it I get the following error "Cannot access a disposed object named "Form2"

Has anyone seen this before?

What am I doing wrong?

 

[DotNetDoc]

In most cases you should not hide your Form. You should dispose it and recreate the object each time.

Dim myForm as Form1

myForm = New Form1
myForm.Show



myForm.Dispose


Then just recreate it when needed again

myForm = New Form1
myForm.Show

If you need to keep your form in memory for some reason you could catch the onClosing Event and cancel the event.


DotNetDoc
M.C.S.D.

http://www.DotNetDoc.com

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[auxcom]

This is also a problem w/ me.

I like to have only one instance of the form. Using

Dim myForm as Form1

myForm = New Form1
myForm.Show


will create many instance of the form. How can I just do that?

AUXilliary COMmunication 1

 

[RebeccaLynn]

Personally I set a variable like myFormOpen to true when i show the form, and to false when I close it.

Then I add an if block to the show line ....

If myFormOpen = False Then
myFormOpen = True
Dim myForm as Form1
myForm = New Form1
myForm.Show
Else
MsgBox("Can only open one myForm at a time&quot
End IF

then in the closing event of myForm

myFormOpen = False

Hope that helps.


Becca

Somtimes, the easy answer is the hardest to find.

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