How to exit or quit my Windows Phone 8 app programmatically?

Question

I am developing a Windows Phone 8 application.

1. How can I exit or quit programmatically (through code) from my Windows Phone 8 app?

2. What are

Answer 1

while (((PhoneApplicationFrame)App.Current.RootVisual).CanGoBack)
{
    ((PhoneApplicationFrame)App.Current.RootVisual).RemoveBackEntry();
}