1. Create a new Xamarin.Android application. The project template will create a single activity named Activity1 (MainActivity.cs), which contains a button.
2. From the button.Click handler in MainActivity.cs, create a Uri and an Intent.

intent.button.Click += delegate {
       var uri = Android.Net.Uri.Parse ("http://www.xamarin.com");
       var intent = new Intent (Intent.ActionView, uri);
       StartActivity (intent);
};

Calling StartActivity and passing it the Intent in the above code launches the browser app.

Each screen in an application is represented by an activity. Using asynchronous messages called intents, when created from a Uri, causes the system to load an activity that can handle the Uri scheme. In this recipe a Uri beginning with http:// loads an activity from the browser application to display the page.