using System;

using System.Drawing;

using System.Windows.Forms;

public class SimpleEditForm : System.Windows.Forms.Form

{

    private System.Windows.Forms.MenuItem mnuFile;

    private System.Windows.Forms.MenuItem mnuOpen;

    private System.Windows.Forms.MenuItem mnuSave;

    private System.Windows.Forms.MenuItem mnuExit;

    private System.Windows.Forms.RichTextBox rtDoc;

    // (Bỏ qua phần mã designer.)

    private void mnuOpen_Click(object sender, System.EventArgs e)

    {

        OpenFileDialog dlg = new OpenFileDialog();

        dlg.Filter = "Rich Text Files (*.rtf)|*.RTF|" +

        "All files (*.*)|*.*";

        dlg.CheckFileExists = true;

        dlg.InitialDirectory = Application.StartupPath;

        if (dlg.ShowDialog() == DialogResult.OK)

        {

            rtDoc.LoadFile(dlg.FileName);

            rtDoc.Enabled = true;

        }

    }

    private void mnuSave_Click(object sender, System.EventArgs e)

    {

        SaveFileDialog dlg = new SaveFileDialog();

        dlg.Filter = "RichText Files (*.rtf)|*.RTF|Text Files (*.txt)|

        *.TXT" +

    "|All files (*.*)|*.*";

        dlg.CheckFileExists = true;

        dlg.InitialDirectory = Application.StartupPath;

        if (dlg.ShowDialog() == DialogResult.OK)

        {

            rtDoc.SaveFile(dlg.FileName);

        }

    }

    private void mnuExit_Click(object sender, System.EventArgs e)

    {

        this.Close();

    }

}