public MainWindow() : base(Gtk.WindowType.Toplevel)
{
column1 = new TreeViewColumn("Sentences", cellView1);
column1.AddAttribute(cellView1, "text", 0);
Build();
treeview1.Model = array1;
treeview1.AppendColumn(column1);
array1.InsertWithValues(0, "Hello World!!1");
array1.InsertWithValues(1, "How are you ?");
array1.InsertWithValues(2, "English");
array1.InsertWithValues(3, "Rust is fast");
}