static void Main(string[] args)
{
Console.WriteLine("Memento pattern demo...");
List <IMemento <SurveyState> > surveySnapshot = new List <IMemento <SurveyState> >(); //Caretaker
var survey = new Survey()
{
Name = "test"
};
survey.AddAnswer(1, "I like c#");
survey.AddAnswer(2, "Yes");
Console.WriteLine(survey);
Console.WriteLine("---");
surveySnapshot.Add(survey.CreateSnapshot());
survey.AddAnswer(3, "No");
Console.WriteLine(survey);
Console.WriteLine("---");
survey.RestoreSnapshot(surveySnapshot.Last());
Console.WriteLine(survey);
Console.WriteLine("---");
}