Form1 will be my main form.
When I click on a button, form2 appear. What can i do to make it in a
way that the user can't click on form1 till the user close form2 ? Coz
form1 fill the whole screen and when the user click on the button and
form2 appear and if the user accidentally click on form1, form2 will
just hide behind form1. This will lead to user misunderstood that form2
is missing.