Perhaps I am misunderstanding your question, but to show a form that has
been hidden:

form.Visible = true;

Hi Ramesh

I would think that what you actually want to do is to not create the
forms until they are needed rather than create them but have them
hidden - otherwise you're using up resources needlessly (if the user
can't see them etc then what's the point of having them 'open'?).  It
may be better to just create the forms when they're needed.

Cheers
Martin