I have a standard VB Form with a button. The button opens a new MDI form. If I open the MDI form and then open several (blank) child forms then close the MDI form, the Memory slowly creeps up. I've tried using GC.COLLECT() to free up the memory after closing the MDI form but no joy.

Is there anything else I could try (or should be doing) to prevent this memory leak?

Thanks

hi there.. well.. you could try dispose all the open forms in the unload event of the mdi form...

HTH

Gonzalo

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Can you be more specific in terms of the code you'd use to dispose the child forms and by the term "unload event"???

Here's what I've been trying (in the "FormClosing" event of the MDI)
(Note: All child forms are owned by the MDI form)

    Private Sub MDIParent1_Disposed(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Disposed

        Dim frm As Form

        For Each frm In Me.OwnedForms
            frm.Close()
            frm = Nothing
        Next frm

        GC.Collect()
    End Sub

instead of frm = nothing, better you do something like frm.dispose... also don't call the GC by your own, it will recall the memory by itself an it's a expensive call to do...

are you disposing the objects you are using in every form also???

HTH

Gonzalo

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Hi

Using Dispose instead didn't change the behaviour. Here's where I notice the memory buildup:

If I close the child form down manually (e.g. mouse click on upper right-hand corner X) then close the MDI form down, the Memory goes back to normal. If close down the MDI form manually (e.g. mouse click the upper right-hand corner) whilst the child form is still open then the memory stays up.

Regarding disposing objects - the memory build up happens even if there are no controls/objects on the child forms. However I did incorporate disposing of all objects on each child form as a precaution. Still no luck though.

Thx.

looks like you are not alone with this problem
http://www.thescripts.com/forum/thread650021.html

anyway... try move you code to formclosing event.. but even that it can take a while till GC collect it...

HTH

Gonzalo

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