public void Add(string paymentName, DateTime date, decimal amount)
{
var newItem = new CashFlowItem(paymentName, date, amount, _last);
_items.Add(newItem);
_last = newItem;
}
public CashFlowItem(string paymentName, DateTime date, decimal amount, CashFlowItem previous)
: this(paymentName, date, amount)
{
this._previous = previous;
}