protected void ValidateAmount(decimal amount)
        {
            AmountValidationUtility.ValidateGreaterThan0(amount, "Broker");

            if (amount > MaxAmount)
            {
                throw new ArgumentException("Broker amount must be less or equal to 100.");
            }

            AmountValidationUtility.ValidateIsMultipleOf10(amount, "Broker");
        }
        private void ValidateAmount(decimal amount)
        {
            AmountValidationUtility.ValidateGreaterThan0(amount, "Order");

            AmountValidationUtility.ValidateIsMultipleOf10(amount, "Order");
        }