public partial class Quiz : Form
    {
        private int score;//punkty
        private int questionNumber=0;//numer pytania
        private String anserw;//odpowiedz
        public Quiz()
        {
            InitializeComponent();
        }

        private void Quiz_Load(object sender, EventArgs e)
        {
            loadNextQuestion();
        }
        private void loadNextQuestion()
        {
            questionNumber++;
            switch (questionNumber)
            {

                case 1: questionsLabel.Text = "2+2?";
                    buttonA.Text = "6";
                    buttonB.Text = "8";
                    buttonC.Text = "4";
                    buttonD.Text = "5";
                    anserw = "4";
                    break;

                case 2:
                    questionsLabel.Text = "5 * 5?";
                    buttonA.Text = "25";
                    buttonB.Text = "20";
                    buttonC.Text = "30";
                    buttonD.Text = "55";
                    anserw = "25";
                    break;

                case 3:
                    questionsLabel.Text = "Kto wygral Lige mistrzow w 2017 roku?";
                    buttonA.Text = "Real Madird";
                    buttonB.Text = "FC Barcelona";
                    buttonC.Text = "AC Milan";
                    buttonD.Text = "Manchester United";
                    anserw = "Real Madird";
                    break;

                case 4:
                    questionsLabel.Text = "Kto wygral Lige mistrzow w 2016 roku?";
                    buttonA.Text = "PSG";
                    buttonB.Text = "Atletico Madrid";
                    buttonC.Text = "Real Madird";
                    buttonD.Text = "Manchester City";
                    anserw = "Real Madird";
                    break;

                case 5:
                    questionsLabel.Text = "Kto wygral Premier League w 2017 roku?";
                    buttonA.Text = "Arsenal";
                    buttonB.Text = "Chelsea";
                    buttonC.Text = "Manchester United";
                    buttonD.Text = "Manchester City";
                    anserw = "Chelsea";
                    break;

                default: questionsLabel.Text = "Twoj koncowy wynik to: "+score;
                    break;
            }
        }

        private void buttonA_Click(object sender, EventArgs e)
        {
            string choice = buttonA.Text;
            if(choice== anserw)
            {
                infoLabel.Text = "Dobra odpowiedz";
                score++;
            }
            else
            {
                infoLabel.Text = "Zla odpowiedz";
            }
            scoreLabel.Text = "Score : " + score;
            loadNextQuestion();
        }

        private void buttonB_Click(object sender, EventArgs e)
        {
            string choice = buttonB.Text;
            if (choice == anserw)
            {
                infoLabel.Text = "Dobra odpowiedz";
                score++;
            }
            else
            {
                infoLabel.Text = "Zla odpowiedz";
            }
            scoreLabel.Text = "Score : " + score;
            loadNextQuestion();
        }

        private void buttonC_Click(object sender, EventArgs e)
        {
            string choice = buttonC.Text;
            if (choice == anserw)
            {
                infoLabel.Text = "Dobra odpowiedz";
                score++;
            }
            else
            {
                infoLabel.Text = "Zla odpowiedz";
            }
            scoreLabel.Text = "Score : " + score;
            loadNextQuestion();
        }

        private void buttonD_Click(object sender, EventArgs e)
        {
            string choice = buttonD.Text;
            if (choice == anserw)
            {
                infoLabel.Text = "Dobra odpowiedz";
                score++;
            }
            else
            {
                infoLabel.Text = "Zla odpowiedz";
            }
            scoreLabel.Text = "Score : " + score;
            loadNextQuestion();
        }
    }