Visual Basic.NET 2005 question?

Question

I want to make a button visible after I close a form in an MDI...does anyone know how I would do that. so far I have:

If aChildTwoForm.Close Then

childOneToolStripButton.Enabled = True

Else

childOneToolStripButton.Enabled = False

End If

but I'm getting an error that says, "Expression does not produce a value."

Answer 1

childOneToolStripButton.Visible=True

Answer 2

"Close" is a procedure that does not return a value, like a command, therefore you cannot test if it is True or not.

Depending on how you close your form you should check to see if it is "Nothing" and if it is "Disposed".

Change this:

If aChildTwoForm.Close Then

To this:

If aChildTwoForm Is Nothing OrElse aChildTwoForm.IsDisposed = True Then

This will check to see if aChildTwoForm has not been created or if it has been closed.