I need to get the values from an array that I want to put into a combobox

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace Arsalan_Salam_991571527_A2
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            AddingEnumIntoComboBox(null);
            AddingIntArrayIntoComboBox(null);
        }
        //private List<Product> _products = new List<Product>();
        private CarRepository _carRepository = new CarRepository();
        private Car CaptureProductInfo()
        {
            string vinNumber = vinNumberInput.Text;
            string carMake = carMakeInput.Text;
            CarType typeOfCar = (CarType)carTypeInput.SelectedItem;
            float purchasePrice = float.Parse(purchasePriceInput.Text);
            int modelYear = Int32.Parse((string)modelYearInput.SelectedItem);
            int mileage = Int32.Parse(mileageInput.Text);
            Car c = new Car(vinNumber, carMake, typeOfCar, purchasePrice, modelYear, mileage);
            AddingIntArrayIntoComboBox(c);
            return c;
        }
        private void RenderProductInfo(Car car)
        {
            vinNumberInput.Text = car.VinNumber;
            carMakeInput.Text = car.CarMake;
            carTypeInput.Text = car.TypeOfCar.ToString();
            purchasePriceInput.Text = car.PurchasePrice.ToString();
            modelYearInput.Text = car.ModelYear.ToString();
            mileageInput.Text = car.Mileage.ToString();
        }
        private void ClearUI()
        {
            vinNumberInput.Text = "";
            carMakeInput.Text = "";
            carTypeInput.Text = "";
            purchasePriceInput.Text = "";
            modelYearInput.Text = "";
            mileageInput.Text = "";
            errorMessageOutput.Text = "";
        }
        private void OnCarSelectionChanged()
        {
            //1. get the selected product
            Car c = (Car)lstCarDetailOutput.SelectedItem;

            //2. render the fields in the textboxes
            RenderProductInfo(c);
        }
        private void AddingEnumIntoComboBox(object p)
        {
            foreach (var item in Enum.GetValues(typeof(CarType)))
            {
                var carTypeName = Enum.GetName(typeof(CarType), item);
                carTypeInput.Items.Add(carTypeName);
            }
        }
        private void AddingIntArrayIntoComboBox(Car c) 
        {
            for (int i = 0; i < c._modelYear.Length; i++)
            {
                int year = c._modelYear[i];
                modelYearInput.Items.Add(year);
            }
        }
        private void addingCar_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                //_products.Add(CaptureProductInfo());
                Car c = CaptureProductInfo();
                _carRepository.AddProduct(c);
                lstCarDetailOutput.Items.Add(c);//the advantage of adding Product rather than a string?
            }
            catch (Exception ex)
            {
                errorMessageOutput.Text = ex.Message;
            }
            //
        }
        private void clearing_Click(object sender, RoutedEventArgs e)
        {
            ClearUI();
        }
        private void updatingCar_Click(object sender, RoutedEventArgs e)
        {
            OnCarSelectionChanged();
        }
    }
}

private void AddingIntArrayIntoComboBox(Car c) 
        {
            for (int i = 0; i < c._modelYear.Length; i++)
            {
                int year = c._modelYear[i];
                modelYearInput.Items.Add(year);
            }
        }