Xamarin Exception Sample

/* MAINVIEW.CS */
public class MainView : ContentPage
    {
        public MainView()
        {
            // Label Header
            Label header             = new Label();
            header.Text              = "Main Menu";
            header.Font              = Font.BoldSystemFontOfSize (40);
            header.HorizontalOptions = LayoutOptions.Center;

            // Declaring Buttons
            Button btnGetAllUsers      = new Button ();
            btnGetAllUsers.Text        = "Get All Users";
            btnGetAllUsers.Font        = Font.BoldSystemFontOfSize (NamedSize.Large);
            btnGetAllUsers.BorderWidth = 1;

            Button btnCreateUser      = new Button();
            btnCreateUser.Text        = "Create a User";
            btnCreateUser.Font        = Font.BoldSystemFontOfSize(NamedSize.Large);
            btnCreateUser.BorderWidth = 1;

            // Button Click Events
        // I AM PUSHING THE SAME VIEW CLASS ON THE "BUTTON CLICK EVENT" JUST TO ILUSTRATE THE EXCEPTION. THE SAME ERROR IS RAISED
            // BY DOING THIS.
            btnGetAllUsers.Clicked += async (sender, args) => await Navigation.PushAsync (ViewsHandler.GetMainPage());

            // Building the Page
            this.Content = new StackLayout
            {
                Children =
                {
                    header,

                    new StackLayout
                    {
                        HorizontalOptions = LayoutOptions.Center,
                        Children = { btnGetAllUsers, btnCreateUser }
                    }
                }
            };
        }
    }

/* VIEWS HANDLER.CS - JUST A WRAPPER TO PROVIDE NEW INSTANCES OF THE VIEWS */
public class ViewsHandler
{
        public static Page GetMainPage()
        {
            return new NavigationPage (new MainView());
        }

        public static Page GetUsersListPage()
        {
            return new NavigationPage (new UsersListView ());
        }
}

/* ANDROID INITIALIZATION CODE */
public class MainActivity : AndroidActivity
{
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Initializing Xamarin Form
            Xamarin.Forms.Forms.Init (this, bundle);

            // Setting main page
            SetPage (ViewsHandler.GetMainPage());
        }
}

/* WINDOWS PHONE INITIALIZATION CODE */
public MainPage()
{
            InitializeComponent();

            // Sample code to localize the ApplicationBar
            //BuildLocalizedApplicationBar();

            Forms.Init ();

            Content = TrumpetMobile.Views.ViewsHandler.GetMainPage().ConvertPageToUIElement (this);
}