MillagePage.xaml.cs

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

using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using HarPadRee.Models;
namespace HarPadRee
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class MillagePage : ContentPage
    {
        int ID;
        public MillagePage(int CarID, string CarName)
        {
            InitializeComponent();
            Title = CarName + " Services";
            ID = CarID;

            List<MilleageModel> millage = App.MillageRepo.GetAllMillage(ID);
            MillageList.ItemsSource = millage;

            MessagingCenter.Subscribe<App>((App)Application.Current, "UpdateMillage", (sender) =>
            {
                UpdateListview();
            });
        }

        private void AddBtn_Clicked(object sender, EventArgs e)
        {
            Navigation.PushAsync(new AddPage(2, ID));
        }
        private void UpdateListview()
        {
            List<MilleageModel> millage = App.MillageRepo.GetAllMillage(ID);
            MillageList.ItemsSource = millage;
        }
    }
}