PersonClass

using System.Collections.Generic;
using System.Linq;

namespace BankAccount
{
    public class StartUp
    {
        private static void Main(string[] args)
        {
            //Person person = new Person();
            //person.Name = "Pesho";
            //person.Age = 23;

            //Person person2 = new Person();
            //person2.Name = "Stamat";
            //person2.Age = 33;
            //Person person3 = new Person();
            //person3.Name = "Gosho";
            //person3.Age = 11;
            //BankAccount bankAccount = new BankAccount();
            //person.GetBalance();
        }
    }

    public class BankAccount
    {
        private int id;
        private decimal balance;

        public int ID
        {
            get { return id; }
            set { id = value; }
        }

        public decimal Balance
        {
            get { return balance; }
            set { balance = value; }
        }
    }

    public class Person
    {
        private string name;
        private int age;
        private List<BankAccount> accounts;

        public Person(string name, int age)
        {
            this.name = name;
            this.age = age;
            accounts = new List<BankAccount>();
        }

        public Person(string name, int age, List<BankAccount> accounts)
        {
            this.name = name;
            this.age = age;
            this.accounts = accounts;
        }

        public List<BankAccount> Accounts
        {
            get { return accounts; }
            set { accounts = value; }
        }

        public int Age
        {
            get { return age; }
            set { age = value; }
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public decimal GetBalance()
        {
            return accounts.Sum(x => x.Balance);
        }
    }
}