/// <summary>
        /// This is called when a door is taken within a regular turn:
        /// If the player has a key in the corresponding color he is able to play this key to obtain the card or put the card on the limbus.
        /// if the player chooses to play a Door te index of the propper key wihtin the hand is returned
        /// </summary>
        /// <param name="door">The door, which has to be handled</param>
        private int handleDoor(GameCard door)
        {
            int index = -1;
            for (int i = 0; i < hand.CardsOnHand.Count; i++)
            {
                if ((hand.CardsOnHand[i].isKey()) && (door.CardColor == hand.CardsOnHand[i].CardColor))
                {
                    index = i;
                    break;
                }
            }
            if (index != -1)
            {
                //Propper key found. Show Dialog to ask user whether to use Key for door aquisition or not

                //By default say yes
            }
            return index;
        }
 public void addCardToHand(GameCard card)
 {
     if (this.cardsOnHand.Count>=handLimit)
     throw new Exception("Hand-Limit reached");
     this.cardsOnHand.Add(card);
 }