How To Code Exit Button

How do I coding My Exit Button

This Is My Code
-------------------
Declare
obutton number;
begin

obutton := Show_alert('ALT_EXIT');
clear_block(no_validate);
If obutton = ALERT_BUTTON1 Then
-- commit;
exit_form(no_validate);
else
exit_form(no_validate);
end if;
end;
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But When I pressed Yes Or No the database is not update. Why ? I have save My data with save button already no problem but why i close this form The data is'nt save?

So i have to put "summit;" in it when ALT_EXIT pass another warning* appear how do i exit program without the second warning

*it say about"2 record i already updated" about this but i can't remember exactly.