I have a form that has a button that call another form. But i want release the form1 before calling the form2. Where i need to put the code?

I want that the code reside inside the form1. I inclide this code inside the click event of the button in form1.

THISFORM.RELEASE
DO FORM form2

But i notice that the form1 is still in memory as an Object with a .NULL. value.
What will be happened if I open 10 forms from inside each form?

Thanks,