void SetBillingCountry()
{
countryPicker.SelectedIndex = countryPicker.SelectedIndex > -1 ? countryPicker.SelectedIndex : 0;
var selectedValue = countryPicker.Items[countryPicker.SelectedIndex];
_currentDiscoveredCountry = _countryDiscoverer.DiscoverCountry(selectedValue);
postcodeEntry.Placeholder = _currentDiscoveredCountry.GetPostcodeTitle();
postcodeEntry.Text = string.Empty;
if (_currentDiscoveredCountry.IsPostcodeNumeric())
{
postcodeEntry.Keyboard = Keyboard.Numeric;
postcodeEntry.Digits = "0123456789";
}
else
{
postcodeEntry.Keyboard = Keyboard.Text;
postcodeEntry.Digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
}
postcodeEntry.MaxLength = _currentDiscoveredCountry.GetPostcodeLength();
postcodeEntry.IsEnabled = _currentDiscoveredCountry.IsPostcodeRequired();
Validate(postcodeEntry);
}