private void AddCust_Click(object sender, RoutedEventArgs e)
{
name = NAME.Text;
lname = LNAME.Text;
phone = PHONE.Text;
SQL_Calls.AddNewCustomer(name, lname, phone);
//clear the text
NAME.Text = "";
LNAME.Text = "";
PHONE.Text = "";
//refresh the view
CustomersView.ItemsSource = null;
ZP_Customers.CustList.Clear();
ZP_Customers.CustList = SQL_Calls.Select_Customers();
CustomersView.ItemsSource = ZP_Customers.CustList;
}