title: Xamarin/Android, how to when click Back activity, value in the MainActivity will change
body: <p><P>
  Suppose in the MainActivity I have a TextView called "Your Name" and also SharedPreferences and a Button "Change Name" which will go to Activity 2. <P>The Activity 2 will show a textbox "Your Name" and after modify and click button "Save". <P>The SharedPreferences will be applied.<P> How to make sure that after Click "Save" and SharedPreferences is edited and when I click "Back" activity/button, the "Your Name" TextView will change?
  <P>The current issue I am having is that, I would need to close the app and open again to see the changes of "Your Name".</p>
  
  <p><P> Thank you</p>