[1.0/1.1] Checking whether the form is disposed or not!

[pvbangera]

On a mdi's menu click i am calling a child form.

On the click event I want to check whether the form is already initiated. if not then i want to initiate it first and then call the show method. on closing the form i dispose it.

How to chk whether the form is disposed or not?

IsNothing is not working