How to “Dequeue” Element from a List?

If you want to dequeue the first element, you could simply use a Queue<T>.

class Program
{
    static void Main(string[] args)
    {
        var _deck = new Queue<String>();
        _deck.Enqueue("2h");
        _deck.Enqueue("3h");
        _deck.Enqueue("4h");
        _deck.Enqueue("...");

        var first = _deck.Dequeue(); // 2h
        first = _deck.Dequeue(); // 3h
    }
}

If you want to pop the last element, you could use a Stack<T>.

class Program
{
    static void Main(string[] args)
    {
        var _deck = new Stack<String>();
        _deck.Push("2h");
        _deck.Push("3h");
        _deck.Push("4h");
        _deck.Push("...");

        var first = _deck.Pop(); // ...
        first = _deck.Pop(); // 4h
    }
}