using System;
using System.Windows.Forms;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Random random = new Random();

        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();  // Clear previous results
            int randomSayi = random.Next(1, 500);
            asalbul(randomSayi);
        }

        private void asalbul(int sayi)
        {
            for (int i = 2; i <= sayi; i++)
            {
                if (IsPrime(i))
                {
                    listBox1.Items.Add(i);  // Add prime numbers to the list
                }
            }
        }

        // Helper method to check if a number is prime
        private bool IsPrime(int number)
        {
            if (number <= 1) return false;
            if (number == 2) return true;

            for (int i = 2; i <= Math.Sqrt(number); i++)
            {
                if (number % i == 0)
                {
                    return false;
                }
            }
            return true;
        }
    }
}