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Push-Notifications

With iOS 8+ the way you register for push notifications has changed a bit. So if you want your app to continue receiving push notifications on iOS 8 and above you will need to adjust your registration to this:

var settings = UIUserNotificationSettings.GetSettingsForTypes(UIUserNotificationType.Sound
    | UIUserNotificationType.Alert | UIUserNotificationType.Badge, null);

UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
UIApplication.SharedApplication.RegisterForRemoteNotifications();

To continue supporting iOS7 and bellow you can still register as before or just use the lines bellow:

if (UIDevice.CurrentDevice.CheckSystemVersion(8, 0))
{
    var settings = UIUserNotificationSettings.GetSettingsForTypes(UIUserNotificationType.Sound
        | UIUserNotificationType.Alert | UIUserNotificationType.Badge, null);

    UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
    UIApplication.SharedApplication.RegisterForRemoteNotifications();
}
else
{
    const UIRemoteNotificationType notificationTypes = UIRemoteNotificationType.Alert
                                                       | UIRemoteNotificationType.Badge
                                                       | UIRemoteNotificationType.Sound;

    UIApplication.SharedApplication.RegisterForRemoteNotificationTypes(notificationTypes);
}

Conclusion

I stumbled over this one as I was following along the Azure push notification hub tutorial. Hope it will be of some help to you.