public MainWindow()
        {
            InitializeComponent();
            string connStr = "server=localhost;user=root;database=carsdb;password=0000;";
            MySqlConnection conn = new MySqlConnection(connStr);
            conn.Open();

            string sql = "SELECT id, mark, model, price FROM cars";
            MySqlCommand command = new MySqlCommand(sql, conn);

            MySqlDataReader reader = command.ExecuteReader();
            while (reader.Read())
                {
                lstCars.Items.Add(reader[0].ToString() + " " + reader[1].ToString() + " " + reader[2].ToString() + " " + reader[3].ToString());
                }

            conn.Close();
        }