private void Add_C_C_Click(object sender, RoutedEventArgs e)
        {
            if (File.Exists("../../lorries.xml"))
            {
                wnd.lc = Serializing.Deserialize_c(wnd.lc);
            }
            else
            {
                wnd.lc.Cars = new List <Car>();
            }
            Car cr = new Car(Name.Text, int.Parse(Prod_Year.Text), Type_eng.Text, int.Parse(Capacity.Text), drGear.Text, int.Parse(Power.Text));

            wnd.lc.Cars.Add(cr);
            Serializing.Serialize_c(wnd.lc);
            wnd.Table.Items.Add(cr);
            this.Close();
        }
        public MainWindow()
        {
            InitializeComponent();
            if (File.Exists("../../lorries.xml"))
            {
                lr = Serializing.Deserialize_l(lr);

                foreach (var item in lr.Lorries)
                {
                    Table1.Items.Add(item);
                }
            }
            if (File.Exists("../../cars.xml"))
            {
                lc = Serializing.Deserialize_c(lc);

                foreach (var item in lc.Cars)
                {
                    Table.Items.Add(item);
                }
            }
        }