C#_WinForms_ListView_File

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

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            ListViewItem lvi = new ListViewItem(textBox1.Text);
            lvi.SubItems.Add(textBox2.Text);
            lvi.SubItems.Add(textBox3.Text);
            listView1.Items.Add(lvi);

            FileStream file = File.Open("C:\\Users\\Stoyan\\Desktop\\data.txt", FileMode.Append);
            StreamWriter strWriter = new StreamWriter(file);
            strWriter.WriteLine(textBox1.Text + "," + textBox2.Text + "," + textBox3.Text);
            strWriter.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string title, author, isbn;
            string[] result;
            string[] stringSeparators = new string[] { "," };
            FileStream inFile = null;
            // enter C:\Users\Stoyan\Desktop\data.txt in the field
            if (textBox4.Text == "") {
                MessageBox.Show("The filename can not be empty");
                return;
            }

            try
            {
                inFile = new FileStream(textBox4.Text, FileMode.Open, FileAccess.Read); //"C:\\Users\\Stoyan\\Desktop\\" +
            }
            catch (FileNotFoundException) {
                MessageBox.Show("File Not Found!");
                return;
            }

            StreamReader reader = new StreamReader(inFile);
            string recordIn = reader.ReadLine();
            result = recordIn.Split(stringSeparators, StringSplitOptions.None);
            while (recordIn != null)
            {
                title = result[0];
                author =  result[1];
                isbn = result[2];
                ListViewItem lvi = new ListViewItem(title);
                lvi.SubItems.Add(author);
                lvi.SubItems.Add(isbn);
                listView1.Items.Add(lvi);

                recordIn = reader.ReadLine();
                if (recordIn != null)
                {
                    result = recordIn.Split(stringSeparators, StringSplitOptions.None);
                }
            }
            reader.Close();
            inFile.Close();
        }

        private void textBox1_Validating(object sender, CancelEventArgs e)
        {
            if (textBox1.Text == "")
            {
                errorProvider1.SetError(textBox1, "Please enter the Title");
            }
            else
            {
                errorProvider1.SetError(textBox1, "");
            }
        }

        private void textBox4_Validating(object sender, CancelEventArgs e)
        {
            if (textBox4.Text == "")
            {
                errorProvider1.SetError(textBox4, "Please enter the Name of the File");
            }
            else
            {
                errorProvider1.SetError(textBox4, "");
            }

        }

        private void textBox2_Validating(object sender, CancelEventArgs e)
        {
            if (textBox2.Text == "")
            {
                errorProvider1.SetError(textBox2, "Please enter the Author");
            }
            else
            {
                errorProvider1.SetError(textBox2, "");
            }
        }

        private void textBox3_Validating(object sender, CancelEventArgs e)
        {
            if (textBox3.Text == "")
            {
                errorProvider1.SetError(textBox3, "Please enter the ISBN");
            }
            else
            {
                errorProvider1.SetError(textBox3, "");
            }
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}