随机产生扑克点数与花色

想随机产生不重复的随机点数和花色，代码如下
namespace CardTest
{
    public enum CardType
    {
        Spade, Heart, Club, Diamond
    }
    public class Card
    {
        private int _count;
        private CardType _type;       
        public int Count
        {
            get { return _count; }
            set { _count = value; }
        }        public CardType Type
        {
            get { return _type; }
            set { _type = value; }
        }        public Card(){}
        public Card(int count, CardType type)
        {
            this._count = count;
            this._type = type;
        }
    }
}namespace CardTest
{
    public class Game
    {
        private static List<Card> listcard = new List<Card>();
    
        public Card GenerateCard()
        {
            Card card = new Card();
            card.Count = new Random().Next(1,14);
            card.Type = GenerateCardType();        
            if (listcard.Contains(card))//到这里不知为什么，就是产生重复点数也不进入
            {
                GenerateCard();
            }
            else
            {
                listcard.Add(card);
            }                     
            return card;
        }        public CardType GenerateCardType()
        {
            int type = new Random().Next(1,5);
            CardType temp = new CardType();
            switch (type)
            {
                case 1: temp = CardType.Spade;
                    break;
                case 2: temp = CardType.Heart;
                    break;
                case 3: temp = CardType.Club;
                    break;
                case 4: temp = CardType.Diamond;
                    break;
            }
            return temp;
        }
    }
}期待高手解答