Have you looked at the specifications of the Form class to see what methods are available?
P.S Always refuse to write any code if you don't have the specs with you.
I've searched all the property and the methods, in form class but there is nothing I can use tho swap between the Forms.
I think I should create 1 Main Form, create other Forms in that, and do all the things with the Main Form. It not as convenient as in VB but it works.
I think VB is still the leader for desktop programming.
Thanks by the way !