private void okButton_Click(object sender, EventArgs e)
{
// need to save this information
Card = new POSCard();
Card.Name = CustomerNameTextBox.Text;
Card.First6 = First6TextBox.Text;
Card.Last4 = Last4TextBox.Text;
Card.Month = MonthComboBox.SelectedItem.ToString();
Card.Year = YearComboBox.SelectedItem.ToString();
Card.Token = Payment.cardTransaction.token;
Store.Cards.Add(Card);
this.Close();
}