Entity framework: where's our data?

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

namespace CarShowRoom.Models
{
    public class CarModel
    { 
        public int Id { get; set; } 
        public string CarModelName { get; set; }
        public string BodyType { get; set; }
    }
}

using CarShowRoom.Models;
using System.Data.Entity;

namespace CarShowRoom
{
    public class Context : DbContext
    { 
        public DbSet<CarModel> CarModels { get; set; }
    }
}

using CarShowRoom.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;

namespace CarShowRoom
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void dataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
        {
            e.Column.Width = new DataGridLength(1, DataGridLengthUnitType.Star);
        } 

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

        }

        private void Car_Model_Click(object sender, RoutedEventArgs e)
        {
            using (var context = new Context())
            {
                context.CarModels.Add(new CarModel()
                {
                    CarModelName = "X5", 
                    BodyType = "BMW type"
                });
                context.CarModels.Add(new CarModel()
                {
                    CarModelName = "X6",
                    BodyType = "BMW another type"
                });
                context.SaveChanges();
                var carModels = context.CarModels.ToList();
                dataGrid.ItemsSource = carModels;
            } 

        }
    }
}