Differences between onnavigatedto and onnavigatedfrom in WP8 Learning

Onnavigatedto: override the onnavigatedto method to check the Navigation Request and prepare the page for display. This method is like initialization (INI). It is executed before the loaded event, so here you can control some operations before initialization or initialization operations. Onnavigatedto is called every time the page becomes an activity (when it is opened for the first time. The Silverlight framework triggers the loaded event every time an element is added to the visualization tree. This event may occur multiple times when a page is activated.

Onnavigatedfrom: override the onnavigatedfrom method to perform the last operation on the page when the page becomes inactive.

Differences between onnavigatedto and onnavigatedfrom in WP8 Learning