private static decimal CalculateNecessary(Instrument instrument, bool isBuy, MarginAndQuantityResult marginArgs, MarginAndQuantityResult filledArgs)
{
MarginAndQuantityResult necessaryParams = new MarginAndQuantityResult();
necessaryParams.Add(isBuy, marginArgs, filledArgs);
var result = instrument.CalculateNecessary(necessaryParams);
return(result.NetNecessary + result.HedgeNecessary);
}