How to know if a form has been disposed?

Well, is there a code to check whether a form has been disposed or not ?

THX

When the form is disposed, the IsDisposed property will be True.

If a form has been disposed, how can I rebuild it again?

Just like opening a new form.

VB Code:

If f Is Nothing OrElse f.IsDisposed Then
    f = New form1
End If
f.Show