//Prevent unnecessary access to the state of the object

​

using System;

​

public class Program

{

    public static void Main()

    {

        var myAccount = new BankAccount();

        myAccount.Deposit = 8;

        myAccount.Deposit = 2;

        myAccount.Withdraw = 9;

        Console.WriteLine($"Hello World ++ {myAccount.Balance}");

    }

}

​

public class BankAccount

{

    public BankAccount()

    {

        _balance = 0;

    }

​

    public decimal Deposit

    {

        set

        {

            if (value > 0)

                _balance += value;

        }

    }

​

    public decimal Withdraw

    {

        set

        {

            if (value > 0 && value <= _balance)

                _balance -= value;

        }

    }

​

    private decimal _balance;

    public decimal Balance

    {

        get

        {

            return _balance;

        }

​

        private set

        {

            if (value > 0)

                _balance = value;

        }

    }

}