public virtual void RemoveCoin(ICoin coin)
{
CurrentRepo.AddCoin(coin);
CoinView coinView = CoinViews.ToList().Find(x => x.Coin == coin);
CoinViews.Remove(coinView);
}
public virtual void AddCoin(ICoin coin)
{
CurrentRepo.AddCoin(coin);
CoinViews.Add(new CoinView((USCoin)coin));
}