private void btnAnualBalance_Click(object sender, EventArgs e) { Client joana = new Client("Joana D'Arc", 40) { Cpf = "000.000.000-00" }; Account accountWhatever = new CurrentAccount() { Number = 1, Titular = joana }; accountWhatever.Deposit(2500.0); double balanceAnual = accountWhatever.AnnualIncome(); MessageBox.Show("Annual Balance of " + accountWhatever.Titular.Name + " is " + balanceAnual); }