private void createContext(String host, int port, String comm, String socketType) {
    myFrame.setTitle("Set One  - " + host);

    if (context != null) {
      context.destroy();
    }
    try {
      context = new SnmpContextPool(host, port, socketType);
      context.setCommunity(comm);
    } catch (java.io.IOException exc) {
      lmessage.setText("IOException: " + exc.getMessage());
      lmessage.setBackground(Color.red);
    }
  }
  public static void main(String[] args) {
    String propFileName = null;
    if (args.length > 0) {
      propFileName = args[0];
    }
    OneBlockOperation application = new OneBlockOperation(propFileName);

    JFrame frame = new JFrame();
    frame.setTitle(application.getClass().getName());
    frame.getContentPane().add(application, BorderLayout.CENTER);
    application.init();

    frame.addWindowListener(
        new WindowAdapter() {
          public void windowClosing(WindowEvent e) {
            System.exit(0);
          }
        });
    frame.setBounds(50, 50, 400, 150);
    frame.setVisible(true);
  }