private void btnAddFunds_Click(object sender, EventArgs e)
{
var value = (checkBoxPay05.Checked ? .05 : 0) +
(checkBoxPay010.Checked ? .10 : 0) +
(checkBoxPay025.Checked ? .25 : 0) +
(checkBoxPay1.Checked ? 1 : 0) +
(checkBoxPay5.Checked ? 5 : 0) +
(checkBoxPay10.Checked ? 10 : 0);
_payController.AddFunds(value);
}