Items[ViewModel_Page]

using System;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Threading.Tasks;

using Xamarin.Forms;

using EntryTest.Models;
using EntryTest.Views;
using System.Globalization;

namespace EntryTest.ViewModels
{
    public class ItemsViewModel : BaseViewModel
    {
        public ObservableCollection<Item> Items { get; set; }
        public Command LoadItemsCommand { get; set; }

        public ItemsViewModel()
        {
            Title = "Browse";
            Items = new ObservableCollection<Item>();
            LoadItemsCommand = new Command(async () => await ExecuteLoadItemsCommand());

            MessagingCenter.Subscribe<NewItemPage, Item>(this, "AddItem", async (obj, item) =>
            {
                var _item = item as Item;
                Items.Add(_item);
                await DataStore.AddItemAsync(_item);
            });
        }

        async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;

            try
            {
                Items.Clear();
                var items = await DataStore.GetItemsAsync(true);
                foreach (var item in items)
                {
                    Items.Add(item);
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
            }
            finally
            {
                IsBusy = false;
            }
        }

		private string amount = "0";
		private float bgFloat;
        private static CultureInfo parseCulture = new CultureInfo("en-US");
        public string Amount
        {
            get
            {
                //if (StopPoint == null) return "0";
                //return StopPoint.NewAmount.ToString();
                return amount;
            }
            set
            {
                var amt = value.Replace(",", ".");
                if (amount == amt) return;

                var parsed = float.TryParse(amt, NumberStyles.AllowDecimalPoint, parseCulture, out float val);

                if (parsed)
                {
                    if (amount == amt)
                    {
						OnPropertyChanged();
                        return;
                    }
                    amount = amt;
					if (val == bgFloat)
                    {
						OnPropertyChanged();
                        return;
                    }

					bgFloat = val;
					OnPropertyChanged();
                }
                else
                {
                    amount = "0";
					bgFloat = 0;
					OnPropertyChanged();
                    return;
                }
            }
        }
    }
}


//////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="EntryTest.Views.ItemsPage"
    Title="{Binding Title}" x:Name="BrowseItemsPage">
    <ContentPage.ToolbarItems>
        <ToolbarItem Text="Add" Clicked="AddItem_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource">
                    <On Platform="UWP" Value="add.png" />
                </OnPlatform>
            </ToolbarItem.Icon>
        </ToolbarItem>
    </ContentPage.ToolbarItems>
    <ContentPage.Content>
        <StackLayout>
            <Label Text="type some numbers!" />
            <Entry Text="{Binding Amount}" WidthRequest="65" HorizontalTextAlignment="End" />
            
            <ListView x:Name="ItemsListView" ItemsSource="{Binding Items}" VerticalOptions="FillAndExpand"
                HasUnevenRows="true" RefreshCommand="{Binding LoadItemsCommand}" IsPullToRefreshEnabled="true"
                IsRefreshing="{Binding IsBusy, Mode=OneWay}" CachingStrategy="RecycleElement" ItemSelected="OnItemSelected">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <StackLayout Padding="10">
                                <Label Text="{Binding Text}" LineBreakMode="NoWrap" Style="{DynamicResource ListItemTextStyle}"
                                    FontSize="16" />
                                <Label Text="{Binding Description}" LineBreakMode="NoWrap" Style="{DynamicResource ListItemDetailTextStyle}"
                                    FontSize="13" />
                            </StackLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>