B(C) 21

BoyutuNe.cs

public class BoyutuNePage : ContentPage
    {
        Label label;
        public BoyutuNePage()
        {
            label = new Label
            {
                FontSize = Device.GetNamedSize(NamedSize.Large, typeof(Label)),
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.Center
            };
            Content = label;
            SizeChanged += OnPageSizeChanged;
        }
        void OnPageSizeChanged(object sender, EventArgs args)
         {
            label.Text = String.Format("{0} \u00D7 {1}", Width, Height);
         }
        }