DrilldownListViewByItem.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;

namespace DrilldownListViewDemoVS
{
    class DrilldownListViewByItem : ContentPage
    {
        public DrilldownListViewByItem()
        {
            Title = "Drilldown List Using ListView";

            ListView listView = new ListView();

            listView.ItemsSource = new ListItem[] {
                new ListItem { Title = "First", Description = "1st item" },
                new ListItem { Title = "Second", Description = "2nd item" },
                new ListItem { Title = "Third", Description = "3rd item" }
            };

            listView.ItemTemplate = new DataTemplate(typeof(TextCell));
            listView.ItemTemplate.SetBinding(TextCell.TextProperty, "Title");

            listView.ItemTapped += async (sender, e) =>
            {
                var item = e.Item as ListItem;
                if (item == null) return;
                await Navigation.PushAsync(new DetailPage(item));
                listView.SelectedItem = null;
            };

            this.Content = listView;
        }
    }
}