C# (CSharp) BackHistory.Pop примеры использования

Пример #1

        public Task GoBackAsync()
        {
            Page page = BackHistory.Pop();

            ForwardHistory.Push(page);
            return(NavigateAsync(page));
        }

Пример #2

        private void NavigateBack(string s)
        {
            ForwardHistory.Push(CurrentDirectory);
            var previousDirectory = BackHistory.Pop();

            Navigate(previousDirectory.Path);
        }