public static void Memento()
{
var textBox = new TextBox();
var caretaker = new Caretaker(textBox);
Console.WriteLine("························ Initialize");
textBox.Text = "Hello world!";
Console.WriteLine("························ Selection 3 -> 3");
textBox.Select(new Selection(3, 3));
textBox.MoveCaretBy(2);
Console.WriteLine(textBox);
caretaker.Snapshot();
Console.WriteLine("························ Snapshot");
Console.WriteLine("························ Edit");
textBox.Text = "Good bye world!";
Console.WriteLine("························ Selection 4 -> 4");
textBox.Select(new Selection(4, 5));
textBox.MoveCaretBy(8);
Console.WriteLine(textBox);
caretaker.Snapshot();
Console.WriteLine("························ Snapshot");
Console.WriteLine("························ Edit");
textBox.Text = "Foo";
Console.WriteLine(textBox);
caretaker.Undo();
Console.WriteLine("························ Undo");
Console.WriteLine(textBox);
caretaker.Undo();
Console.WriteLine("························ Undo");
Console.WriteLine(textBox);
}