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


namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (textBox1.TextLength>0)
                label1.Text = textBox1.Text;
            else
                MessageBox.Show("wprowadz tekst");

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            if (button3_Click.x==true)
            {
            int a;
            int c;

            Int32.TryParse(textBox1.Text,out c);
            if (c!=0)
            {
                a = Int32.Parse(textBox1.Text);
                if (textBox1.Lines.Length < (a - 1))
                {
                    string b;
                    //b = textBox2.Lines[a];
                    MessageBox.Show(textBox2.Lines[a]);


                }
                }
            }
            else
                MessageBox.Show("input error");

        }

        private void button3_Click(object sender, EventArgs e)
        {
            bool x;
            x = true;
        }
    }
}

            button1.Text = "tekst";
            Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button1.Text = "inna nazwa";
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }