Domain.SavingsAccount.SavingsAccount C# (CSharp) Method

        public SavingsAccount(long accountNumber, double initialAmount, Customer accountOwner)
        {
            if (!AccountUtil.ValidAccountNumber(accountNumber))
            {
                throw new ArgumentException("AccountNumber");
            }

            this.accountNumber = accountNumber;
            this.amount = initialAmount;
            this.accountOwner = accountOwner;
        }