The Xamarin.Forms Application

- [Instructor] Xamarin.Forms is gonna have…our user interface, and it's gonna be initialized…from our separate platforms.…As such, when we look in the shared library,…we'll see this app dot xaml file…that represents the Xamarin.Forms application.…Not to be confused with the applications in Android or iOS,…this is a core piece of our shared library in our shared UI.…We can see the xaml file for app dot xaml…allows us to define application-wide resources,…where we might define styles or templates…that we want to reuse, and we can go…into the app dot xaml CS and you'll notice…that as an application, it has a lifecycle.…

We have an OnStart(), an OnSleep(), and an OnResume().…Now, we might want to put some code in here…that loads some data or saves some data…when that happens, so I could use ProductService,…and I'll fix that by adding using statement,…and since we're starting, I might want to load a wishlist,…so one of the things that we'll do in the application…is allow users to tag a particular product as a favorite,…