static void Main(string[] args) { //the name of the App is bad it shuld be Person_Class 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; BankAccounts bankAccount = new BankAccounts(); bankAccount.Deposit(2000.50m); bankAccount.Withdraw(1000.50m); BankAccounts bankAccount2 = new BankAccounts(); bankAccount2.Deposit(30m); List <BankAccounts> accounts = new List <BankAccounts>(); accounts.Add(bankAccount); accounts.Add(bankAccount2); person.Accounts = accounts; decimal a = person.GetBalance(); Console.WriteLine(); }