Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "TextFile" and then click OK
Step 2: Design your form as below

Step 3: Add code to button click event handler as below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace TextFile
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private async void btnRead_Click(object sender, EventArgs e)
{
//Read text file
using(OpenFileDialog ofd = new OpenFileDialog() { Filter="Text Documents|*.txt", ValidateNames = true, Multiselect = false })
{
if (ofd.ShowDialog() == DialogResult.OK)
{
using(StreamReader sr = new StreamReader(ofd.FileName))
{
txtText.Text = await sr.ReadToEndAsync();
}
}
}
}
private async void btnWrite_Click(object sender, EventArgs e)
{
//Write text file
using(SaveFileDialog sfd = new SaveFileDialog() { Filter="Text Documents|*.txt", ValidateNames = true })
{
if (sfd.ShowDialog() == DialogResult.OK)
{
using(StreamWriter sw = new StreamWriter(sfd.FileName))
{
await sw.WriteLineAsync(txtText.Text);
MessageBox.Show("You have been successfully saved.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
}
}
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