How to prevent more than one instance of form from being displayed?

[David Hearn]

I have a button on a main form that uses the following code to open another
window (this is NOT a MDI app):

Dim objCustomize As New frmCustomize

objCustomize.Show()

My problem is that if I click on the button again, it loads another instance
of the form so I now have two of the same form open. How do I prevent this
from happening?

Thanks in advance!

 

[David Hearn]

Nevermind. I figured it out. I check for is nothing and is disposed