private void BtnInitialise_Click(object sender, RoutedEventArgs e)
{
reader = new CardReader();
string[] result = reader.PopulateReaders();
if (result == null)
{
MessageBox.Show("Cannot connect to any readers", "Error");
return;
}
LbxReaders.ItemsSource = result;
LbxReaders.IsEnabled = IsEnabled;
}