Window

using System;
using System.Collections;
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;
using System.IO;
using System.Xml.Serialization;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public abstract class Figura
        {
            public string nazwa;
            public double bok1;
            public double bok2;

            protected Figura(string nazwa, double bok1, double bok2)
            {
                this.nazwa = nazwa;
                this.bok1 = bok1;
                this.bok2 = bok2;
            }

            public abstract void pokaz();
            public abstract void obwod();
        };

        public class Prostokat : Figura
        {
            public string kolor;
            public Prostokat(string nazwa, double bok1, double bok2, string kolor)
                : base(nazwa, bok1, bok2)
            {
                this.kolor = kolor;
            }


            public override void pokaz()
            {
                System.Console.WriteLine("Prostokat " + kolor + " " + nazwa + " " + bok1 + " " + bok2);
            }
            public override void obwod()
            {
                System.Console.WriteLine("Obwod " + (2 * bok1 + 2 * bok2));
            }
        };

        public class Trojkat : Figura
        {
            public string kolor;
            public Trojkat(string nazwa, double bok1, double bok2, string kolor)
                : base(nazwa, bok1, bok2)
            {
                this.kolor = kolor;
            }


            public override void pokaz()
            {
                System.Console.WriteLine("Trojkat " + kolor + " " + nazwa + " " + bok1 + " " + bok2);
            }
            public override void obwod()
            {
                System.Console.WriteLine("Obwod " + (2 * bok1 + bok2));
            }
        }
        List<Figura> lista = new List<Figura>();


        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string nazwa_temp = this.nazwa1.Text;
                string kolor_temp = this.kolor1.Text;
                double bok1_temp = Double.Parse(this.bok11.Text);
                double bok2_temp = Double.Parse(this.bok22.Text);
                if (this.Trojkat1.Checked)
                {
                   lista.Add(new Trojkat(nazwa_temp, bok1_temp, bok2_temp, kolor_temp));
                }
                else
                {

                    lista.Add(new Prostokat(nazwa_temp, bok1_temp, bok2_temp, kolor_temp));
                }

                StringBuilder wyj2 = new StringBuilder();
                for (int i = 0; i < lista.Count; i++)
                {
                    wyj2 = wyj2.Append(lista[i].nazwa + " " + lista[i].bok1 + " " + lista[i].bok2 + System.Environment.NewLine);

                }
                using (StreamWriter ff = new StreamWriter(@"c:\temp\lab4_z2_out.txt"))
                { ff.Write(wyj2); }


}




            catch
            {
                MessageBox.Show("ERROR");
            }

        }
    }
}