public MainWindow()
        {
            InitializeComponent();

            client = new MyMongoClient();

            listDoc = new List<DocMongo>();
            listAuth = new List<DocMongo>();
            listPub = new List<DocMongo>();

            question_431.Click += Question_1_Click;
            open_browser.Click += Open_browser_Click;
            question_authors.Click += Question_authors_Click;
            show_stats.Click += Show_stats_Click;
            question_publisher.Click += Question_publisher_Click;
            show_publisher_stats.Click += Show_publisher_stats_Click;
        }
        public MainWindow()
        {
            InitializeComponent();

            client = new MyMongoClient();

            listDoc  = new List <DocMongo>();
            listAuth = new List <DocMongo>();
            listPub  = new List <DocMongo>();

            question_431.Click         += Question_1_Click;
            open_browser.Click         += Open_browser_Click;
            question_authors.Click     += Question_authors_Click;
            show_stats.Click           += Show_stats_Click;
            question_publisher.Click   += Question_publisher_Click;
            show_publisher_stats.Click += Show_publisher_stats_Click;
        }