using System;

​

public class BankAccount

    {

        private readonly string m_customerName;

        private double m_balance;

​

        private BankAccount() { }

​

        public BankAccount(string customerName, double balance)

        {

            m_customerName = customerName;

            m_balance = balance;

        }

​

        public string CustomerName

        {

            get { return m_customerName; }

        }

​

        public double Balance

        {

            get { return m_balance; }

        }

​

        public void Debit(double amount)

        {

            if (amount > m_balance)

            {

                throw new ArgumentOutOfRangeException("amount");

            }

​

            if (amount < 0)

            {

                throw new ArgumentOutOfRangeException("amount");

            }

​

            m_balance -= amount;

        }

​

        public void Credit(double amount)

        {

            if (amount < 0)

            {

                throw new ArgumentOutOfRangeException("amount");

            }

​

            m_balance += amount;

        }

​

        //use this Main method as a test project and write one example unit test for Debit method, the rest just describe in words

        public static void Main()

        {

        }

    }

​