public void Hit()
{
Hand.Add(GameDeck.GiveCard());
Sum += (int)Hand[(Hand.Count - 1)];
if ((Sum > 21) && (Hand.IndexOf(CardsValue.Ace) >= 0))
{
Hand[Hand.IndexOf(CardsValue.Ace)] = Hand[Hand.IndexOf(CardsValue.Ace)] - 10;
Sum -= 10;
}
}