private void Start_Click(object sender, RoutedEventArgs e)
        {
            Quiz quiz = new Quiz();

            quiz.Show();
            this.Visibility = Visibility.Hidden;
            this.Close();
            Flash flash = new Flash();
            //flash.load_quiz();
            Bridges bridges = new Bridges();

            bridges.Load_Bridges();

            bridges.Questions(0);
            bridges.Load(0);



            Answers answers = new Answers();

            //quiz.Question.Text = flash.quiz1[3].name;
            //Questions questions1 = new Questions();
            //questions1.Load_Questions(0);



            quiz.Question.Text = Convert.ToString(bridges.questions[0]);
            //quiz.Answer.Content = Convert.ToString(answers.answers1[0].isAnwser);
        }
        private void Button_Click(object sender, RoutedEventArgs e) //Categories
        {
            Quiz quiz = new Quiz();

            quiz.Show();
            this.Visibility = Visibility.Hidden;
            this.Close();
            Flash flash = new Flash();
            //flash.load_quiz();
            Bridges bridges = new Bridges();

            bridges.Load_Bridges();

            bridges.Questions(0);
            bridges.Load(0);
        }