C#.NET Program 14

Output:

Code:

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;

using System.IO;

namespace Question_4

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        FileStream fs;

        StreamReader sr;

        StreamWriter sw;

        //For read

        private void button1_Click(object sender, EventArgs e)

        {

            fs = new FileStream("File.txt", FileMode.Open);

            sr = new StreamReader(fs);

            Object ob;

            ob = sr.ReadLine();

            textBox1.Text = ob.ToString();

            sr.Close();

            fs.Close();

        }

        //For write

        private void button2_Click(object sender, EventArgs e)

        {

            fs = new FileStream("File.txt", FileMode.Create);

            sw = new StreamWriter(fs);

            sw.WriteLine(textBox1.Text);

            sw.Close();

            fs.Close();

        }

        //For clear

        private void button3_Click(object sender, EventArgs e)

        {

            textBox1.Clear();

        }

    }

}