using System; using System.IO; using System.Windows.Forms; namespace WindowsFormsApp2 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { StreamWriter streamWriter=new StreamWriter(@”D:\test.txt”); DateTime dt = DateTime.Now; streamWriter.WriteLine(dt.ToString()); streamWriter.Close(); } private void button2_Click(object sender, EventArgs e) { StreamReader streamReader = new StreamReader(@”D:\test.txt”); this.Text = streamReader.ReadToEnd(); streamReader.Close(); } } }