КурсовПроект

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;
using System.IO;

namespace _01_V.Kursov_Proekt
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int i = 0;

            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")
            {

                if (textBox1.Text == "")
                {


                    errorProvider1.SetError(textBox1, "Please enter a name.");


                }

                if (textBox2.Text == "")
                {


                    errorProvider1.SetError(textBox2, "Please enter a family.");


                }

                if (textBox3.Text == "")
                {


                    errorProvider1.SetError(textBox3, "Please enter an EGN.");


                }


            }
            else
            {
                while (i == 0)
                {
                    errorProvider1.Dispose();
                    listView1.View = View.List;

                    listView1.Items.Add(textBox1.Text);
                    listView1.Items.Add(textBox2.Text);
                    listView1.Items.Add(textBox3.Text);
                    i++;
                }
            }
        }



        private void button2_Click(object sender, EventArgs e)
        {
            StreamWriter writer = new StreamWriter("D:\\data.txt",true);
            using (writer)
            {
                foreach (ListViewItem item in listView1.Items)
                {
                    writer.WriteLine(item.Text);

                }

                writer.WriteLine();
            }

            textBox1.Clear();
            textBox2.Clear();
            textBox3.Clear();

            listView1.Clear();

        }
    }
}