public override bool Equals(object obj)
{
if (obj == null || GetType() != obj.GetType())
{
return(false);
}
OptionPair other = (OptionPair)obj;
bool equals = SecurityCode.IgnoreCaseEquals(other.SecurityCode) && StrikePrice.AlmostEqual(other.StrikePrice) &&
Expiry == other.Expiry && PremiumMultiplier == other.PremiumMultiplier;
return(equals);
}