How to preserve multi form data as user moves back and forth?

[liyanage]

I created a form called frm1 and also created a form called frm2.In the beginning frm1 is shown.In frm1 there is a button called btnForward.When click that button(btnForwa rd)it goes to form frm2.In frm2 form there is a button called btnBack. When I click that btnBack button I want to show the frm1 using previously created frm1 object. How can I do this..??