title: How to Call stateful widget(have form) method from another dart file?- Flutter
body: <p>I have a Form in Stateful Widget, in my stateful widget i validate my form with submit method.</p>
  
  <p>In my app i'm showing that form in another page in another dart file.</p>
  
  <p>My form is visible in new page and in appbar actions i'm calling submit method but i don't know how to call that submit method in new dart file.</p>