notatnik monogame

using System;
using Gtk;
using System.IO;

public partial class MainWindow : Gtk.Window
{
    public MainWindow() : base(Gtk.WindowType.Toplevel)
    {
        Build();
    }

    protected void OnDeleteEvent(object sender, DeleteEventArgs a)
    {
        Application.Quit();
        a.RetVal = true;
    }

    protected void OnWklejActionActivated(object sender, EventArgs e)
    {
        var schowek = textview1.GetClipboard(Gdk.Selection.Clipboard);
        textview1.Buffer.PasteClipboard(schowek);
    }

    protected void OnKopiujAction1Activated(object sender, EventArgs e)
    {
        var schowek = textview1.GetClipboard(Gdk.Selection.Clipboard);
        textview1.Buffer.CopyClipboard(schowek);
    }

    protected void OnWytnijAction1Activated(object sender, EventArgs e)
    {
        var schowek = textview1.GetClipboard(Gdk.Selection.Clipboard);
        textview1.Buffer.CutClipboard(schowek, true);
    }

    protected void OnZamknijActionActivated(object sender, EventArgs e)
    {
        MessageDialog md1 = new MessageDialog(null, DialogFlags.Modal, MessageType.Info, ButtonsType.YesNo, "Informacja");
        ResponseType wynik = (ResponseType)md1.Run();
        if (wynik == ResponseType.Yes)
        {
            Application.Quit();
        }
        md1.Destroy();
    }

    protected void OnNowyActionActivated(object sender, EventArgs e)
    {
        textview1.Buffer.Clear();
    }

    protected void OnOtworzActionActivated(object sender, EventArgs e)
    {
        Gtk.FileChooserDialog fileChooser = new Gtk.FileChooserDialog("Wybierz plik", this, FileChooserAction.Open, "Anuluj", ResponseType.Cancel, "Otwórz", ResponseType.Accept);
        if (fileChooser.Run() == (int)ResponseType.Accept)
        {
            String s = File.ReadAllText(fileChooser.Filename);
            textview1.Buffer.Text = s;
            fileChooser.Destroy();
        }
    }
}