public void UpdatePricing(decimal bidPrice, decimal askPrice, DateTime timestamp)
{
// Add price point to history
PricePoint p = new PricePoint(bidPrice, askPrice, timestamp);
_history.AddPoint(ref p);
// and update current values
CurrentBidPrice = bidPrice;
CurrentAskPrice = askPrice;
// Finally, let any interested clients know
var priceUpdate = new PriceUpdate(Symbol, bidPrice, askPrice, timestamp);
NotifySubscribers(priceUpdate);
}