ListItemCell.cs

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

using Xamarin.Forms;

namespace ListViewDemoVS
{
    class ListItemCell : ViewCell
    {
        public ListItemCell()
        {
            Label titleLabel = new Label
            {
                HorizontalOptions = LayoutOptions.FillAndExpand,
                FontSize = 25,
                FontAttributes = Xamarin.Forms.FontAttributes.Bold,
                TextColor = Color.White
            };
            titleLabel.SetBinding(Label.TextProperty, "Title");

            Label descLabel = new Label
            {
                HorizontalOptions = LayoutOptions.FillAndExpand,
                FontSize = 12,
                TextColor = Color.White
            };
            descLabel.SetBinding(Label.TextProperty, "Description");

            Label priceLabel = new Label
            {
                HorizontalOptions = LayoutOptions.End,
                FontSize = 25,
                TextColor = Color.Aqua
            };
            priceLabel.SetBinding(Label.TextProperty, "Price");

            Button button = new Button
            {
                Text = "Buy Now",
                BackgroundColor = Color.Teal,
                HorizontalOptions = LayoutOptions.EndAndExpand
            };
            button.SetBinding(Button.CommandParameterProperty, new Binding("."));

            button.Clicked += (sender, e) =>
            {
                var b = (Button)sender;
                var item = (ListItem)b.CommandParameter;
                // Climb back up the layout tree from the button up
                // through the nested layouts and through the ListView
                // to retrieve the ContentPage.
                // WARNING: This line no longer works.  It causes an
                // invalid cast error at runtime.  It needs to be
                // investigated.
                ((ContentPage)((ListView)((StackLayout)((StackLayout)b.ParentView).ParentView).ParentView).ParentView).DisplayAlert("Clicked", item.Title.ToString() + " button was clicked", "OK");
            };

            StackLayout viewLayoutItem = new StackLayout()
            {
                HorizontalOptions = LayoutOptions.StartAndExpand,
                Orientation = StackOrientation.Vertical,
                Children = { titleLabel, descLabel }
            };

            StackLayout viewLayout = new StackLayout()
            {
                HorizontalOptions = LayoutOptions.StartAndExpand,
                Orientation = StackOrientation.Horizontal,
                Padding = new Thickness(25, 10, 55, 15),
                Children = { viewLayoutItem, priceLabel, button }
            };

            View = viewLayout;
        }
    }
}