using System;

using Accounts;

public class TaskPerformance {  

    public static void Main(String [] args) {

        Account account = new Account();

        account.account_number = 2002;

        Console.WriteLine("Account number is: {0}", account.account_number);

    }

}

namespace Accounts {

    public class Account {

        public int account_number;

    }

}

​