Xamarin forms and picker do not show selected data.

I will add new record later when I update the record that I added, I have to bring all of them full. I can not get the selected data in the selector.

private void lstMyVacations_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
ListView lstView = (ListView)sender;

        if (e.SelectedItem != null)
        {
            var selected = (Model)e.SelectedItem;
            Navigation.PushAsync(new PageRO(selected));
        }

        lstView.SelectedItem = null;
    }

public NewVacationRO(Model model)
{
InitializeComponent();
SelectFill();
var selectedValue = ddlType.Items[ddlType.SelectedIndex];
selectedValue = model.TypeID.ToString();
ddlType.SetBinding(Picker.SelectedItemProperty, model.TypeID.ToString());
}