private void Button_change_Click(object sender, EventArgs e)
{
Payment newPayment = new Payment(Int32.Parse(textBox_amount.Text), DateTime.Parse(datetime_due_date.Text), textBox_description.Text, Boolean.Parse(comboBox_paid.Text.Equals("Yes") ? "true" : "false"));
if (payment.Equals(newPayment))
{
MessageBox.Show("Nothing has changed.");
return;
}
controller.Change(payment, newPayment);
payment = newPayment;
MessageBox.Show("Payment has changed");
}