using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net.Http.Headers;

namespace SoftEng
{
    public static class ApiHelper
    {
        public static HttpClient ApiClient { get; set; }

        public static void InitializeClient()
        {
            ApiClient = new HttpClient();
            ApiClient.DefaultRequestHeaders.Accept.Clear();
            ApiClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoftEng
{
    public class QuizModel
    {
        public List<Results> QuizResults { get; set; }

    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoftEng
{
    public class Results
    {
        public string Question { get; set; }

        public string correct_answer { get; set; }

        public List<string> incorrect_answers { get; set; }

    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;


namespace SoftEng
{
    public class ApiProcessor
    {
        public static async Task<List<Results>> LoadQuiz(int category, string difficulty, string type)
        {
            string url = $"https://opentdb.com/api.php?amount=5&category={ category }&difficulty={ difficulty }&type={ type }";

            using (HttpResponseMessage response = await ApiHelper.ApiClient.GetAsync(url))
            {
                if (response.IsSuccessStatusCode)
                {
                    QuizModel quiz = await response.Content.ReadAsAsync<QuizModel>();

                    return quiz.QuizResults;
                }
                else
                {
                    throw new Exception(response.ReasonPhrase);
                }
            }
        }
    }
}


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SoftEng
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            ApiHelper.InitializeClient();
        }

        private async void submitButton_Click(object sender, EventArgs e)
        {
            var q = await ApiProcessor.LoadQuiz(9, "Easy", "Multiple");
            foreach (Results a in q)
            {
                MessageBox.Show(a.Question);
                MessageBox.Show(a.correct_answer);
            }
        }
    }
}