In our last post of the series, we learned about the base class "Page" and Here in this post we will learn about "PhoneApplicationPage" which is root of any Windows Phone 7 page. Before jumping to the core in depth, a beginner must know all these things. As I am also exploring these for the first time, sharing the same knowledge with you. I hope that, these series of posts will be helpful to a beginner. If you want to know more about PhoneApplicationPage class, read this post to learn about it.