c# offline base

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

namespace MatchingGame
{
    public partial class Form1 : Form
    {
        //Starter
        private bool doImagesMatch()
        {
            string[] splitModern = setModern.Split('\\');
            string[] splitRetro = setRetro.Split('\\');

            string titleRetro = splitRetro[splitRetro.Length - 1];
            string titleModern = splitModern[splitModern.Length - 1];

            if (titleModern == titleRetro)
            {
                return true;
            }
            else
            {
                return false;
            }


        }
        // Starter
        Random randomNumbersGenerator = new Random();
        string ImagesFolder = $@"{AppDomain.CurrentDomain.BaseDirectory}\Graphics";
        int retroImagesCounter = 0;
        string[] retroImages = null;
        string[] modernImages = null;
        string setRetro = null;
        string setModern = null;


        public Form1()
        {
            InitializeComponent();
            //starter
            modernImages = Directory.GetFiles(ImagesFolder + @"\Modern");
            retroImages = Directory.GetFiles(ImagesFolder + @"\Retro");
            //
            loadRetroImage();
            loadRandomModernImage();
        }

        private void loadRetroImage()
        {
            if (retroImagesCounter < retroImages.Length)
            {
                setRetro = retroImages[retroImagesCounter];
                pbRetro.Image = Image.FromFile(setRetro);
                retroImagesCounter++;
            }
            else
            {
                MessageBox.Show("Game over");
                Application.Exit();
            }
        }

        private void loadRandomModernImage()
        {
            int numberOfImages = modernImages.Length;
            int randomNumber = randomNumbersGenerator.Next(numberOfImages);
            setModern = modernImages[randomNumber];
            pbModern.Image = Image.FromFile(setModern);
        }

        private void btnDraw_Click(object sender, EventArgs e)
        {
            loadRandomModernImage();
        }

        private void btnCheck_Click(object sender, EventArgs e)
        {
            if (doImagesMatch())
            {
                MessageBox.Show("Your answer is correct! The images match!!!");
                loadRetroImage();
                loadRandomModernImage();
            }
            else
            {
                MessageBox.Show("Your answer is incorrect! The images do not match!!!");
                loadRetroImage();
                loadRandomModernImage();
            }

        }

    }
}