public HeaderContentPage()
 {
     InitializeComponent();
     BindingContext      = _viewModel = new HeaderContentViewModel();
     this.LayoutChanged += (s, e) =>
     {
         Device.BeginInvokeOnMainThread(async() =>
         {
             await _viewModel.GetHeaderInformation();
         });
     };
 }
 public HeaderContentView()
 {
     InitializeComponent();
     BindingContext = new HeaderContentViewModel();
 }