public virtual void AddCard(int index, Card card, int quantity)
{
var cardInList = Cards.FirstOrDefault(c => c.Index == index);
if (cardInList != null && cardInList.Card == card)
{
cardInList.Quantity += quantity;
}
else if (Cards.Any(c => c.Card == card))
{
throw new Exception("The indexes of given card don't match");
}
else
{
cardInList = new CardInList(card, this, index, quantity);
Cards.Add(cardInList);
card.AddToList(cardInList);
}
}
