private void LoadDB(StartControl startControl)
        {
            string tempFolder     = System.IO.Path.GetDirectoryName(Environment.GetFolderPath(Environment.SpecialFolder.Desktop)) + @"\Documents\RentFlatData\";
            string dbFileName     = "RentFlatDB.txt";
            string fullDBFilePath = tempFolder + "\\" + dbFileName;

            if (!Directory.Exists(tempFolder))
            {
                Directory.CreateDirectory(tempFolder);
                return;
            }
            if (!File.Exists(fullDBFilePath))
            {
                return;
            }

            using (StreamReader reader = new StreamReader(fullDBFilePath))
            {
                string data = reader.ReadToEnd();

                if (data != null)
                {
                    List <Item> items = JsonConvert.DeserializeObject <List <Item> >(data);
                    Message = items.Last <Item>().Name;
                }
            }
        }
        public MainWindow()
        {
            InitializeComponent();
            HideLeftPanel();
            ApplicationStartup applicationStartup = new ApplicationStartup();

            applicationStartup.Run();


            startControl          = new StartControl(MainNavigationHendler);
            leftNavigationControl = new LeftNavigationControl(MainNavigationHendler);
            Column0.Children.Add(leftNavigationControl);
            Column1.Children.Add(startControl);
        }