new

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 Kontrolno_2_zad_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void BT1_Click(object sender, EventArgs e)
        {
            LB1.Items.Clear();

            try
            {
                int number = int.Parse(this.TB1.Text);
                List<int> opit = new List<int>();
                int num = 5;
                if (number >= 1 && number <= 20)
                {
                    for (int i = 0; i <= number; i++)
                    {
                        int b = (int)Math.Pow(num, i);
                        opit.Add(b);
                    }
                    foreach (var element in opit)
                    {
                        LB1.Items.Add(element);

                    }
                }
                else
                {
                    LB1.Items.Add("Not in interval  form 1 to 20");
                }
            }
            catch (Exception exception)
            {
                LB1.Items.Add("Not correct number");
            }

        }
    }
}