SteamAPI Image Loading

public partial class MainPage : Page
    {
        private readonly string _apiKey = "";

        SettingsManager settingsManager = new SettingsManager();
        AppSettings settings;

        public string SteamPath;

        public ObservableCollection<App> Apps { get; set; }

        public MainPage()
        {
            InitializeComponent();
            settings = settingsManager.LoadSettings();
            SteamPath = settings.steampath;

            Apps = new ObservableCollection<App>();
            DataContext = this;
        }

        private void SettingsBtn_Click(object sender, RoutedEventArgs e)
        {
            FrameApp.FrameMain.Navigate(new SettingsPage());
        }

        private async void TestBtn_Click(object sender, RoutedEventArgs e)
        {
            if (!SteamPath.Contains("Steam") || SteamPath == "" || SteamPath == String.Empty || SteamPath == null)
            {
                MessageBox.Show("Incorrect path to the Steam folder!");
                FrameApp.FrameMain.Navigate(new SettingsPage());
            }
            else
            {
                Debug.WriteLine($"### Getting the list of games started ###");
                await GetAllApps();
                Debug.WriteLine($"### End of getting the list of games ###");
            }

        }

        private async void SearchTBX_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                string searchTerm = SearchTBX.Text;
                await SearchGamesAsync(searchTerm);
            }
        }

        public async Task<AppDetails> GetAppDetails(int appId)
        {
            using (var httpClient = new HttpClient())
            {
                try
                {
                    var response = await httpClient.GetStringAsync($"https://store.steampowered.com/api/appdetails/?appids={appId}");
                    var appDetails = JsonConvert.DeserializeObject<Dictionary<string, AppDetails>>(response);

                    if (appDetails.ContainsKey(appId.ToString()) && appDetails[appId.ToString()].Success)
                    {
                        return appDetails[appId.ToString()];
                    }
                    else
                    {
                        Debug.WriteLine($"Error when receiving data for a game with AppID {appId};\n {appDetails.Count}\n{response.ToString()}");
                        return new AppDetails { Success = false, Data = null };
                    }
                }
                catch (Exception ex)
                {
                    Debug.WriteLine($"Error receiving data: {ex.Message}");
                    return new AppDetails { Success = false, Data = null };
                }
            }
        }

        public async Task SearchGamesAsync(string searchTerm)
        {
            using (var httpClient = new HttpClient())
            {
                try
                {
                    var response = await httpClient.GetStringAsync($"http://api.steampowered.com/ISteamApps/GetAppList/v2/");
                    var steamApiResponse = JsonConvert.DeserializeObject<SteamApiResponse>(response);
                    var apps = steamApiResponse.AppList.Apps;

                    var filteredGames = apps.Where(app => app.AppId.ToString().ToLower().Contains(searchTerm.ToLower())).ToList();
                    var tasks = filteredGames.Select(app => ProcessGameAsync(app)).ToList();

                    await Task.WhenAll(tasks);

                    GamesDG.ItemsSource = filteredGames;
                }
                catch (Exception ex)
                {
                    Debug.WriteLine($"Error receiving data: {ex.Message}");
                }
            }
        }

        private async Task ProcessGameAsync(App app)
        {
            var appDetails = await GetAppDetails(app.AppId);
            if (appDetails.Success)
            {
                app.header_image = appDetails.Data?.header_image;
                MessageBox.Show($"Added an image for\nGame: {app.Name} ({app.AppId});\n Image: {app.header_image}");
            }
        }
    }

    public class SteamApiResponse
    {
        public AppList AppList { get; set; }
    }

    public class AppList
    {
        public List<App> Apps { get; set; }
    }

    public class AppDetails
    {
        public bool Success { get; set; }
        public App Data { get; set; }
    }

    public class App
    {
        public int AppId { get; set; }
        public string Name { get; set; }
        public string header_image { get; set; }
    }