@Override
 public void actionPerformed(ActionEvent AE) {
   if (TempControll.ConnectionManagerObject.createConnection())
     if (AE.getSource() == UpdateButton) {
       TempCourseTitle = CourseNameField.getText();
       TempCourseCredit = (String) CourseCreditBox.getSelectedItem();
       if (!TempCourseTitle.equals("")) {
         if (TempControll.DataEraseEditObject.editCourse(
             this.CourseNo, TempCourseTitle, TempCourseCredit))
           JOptionPane.showMessageDialog(
               DEPC,
               "Information of '" + this.CourseNo + "' has been updated successfully.",
               "Updated",
               JOptionPane.INFORMATION_MESSAGE);
         else
           JOptionPane.showMessageDialog(
               DEPC,
               "Information of '"
                   + this.CourseNo
                   + "' hasn't been updated.\nCheck if this course is still available & try again.",
               "Updated",
               JOptionPane.INFORMATION_MESSAGE);
         DEPC.dispose();
       } else
         JOptionPane.showMessageDialog(
             DEPC,
             "Please, complete 'Course Title'  field.",
             "Empty Course Title Field",
             JOptionPane.ERROR_MESSAGE);
     }
 }
  public void createDataEditPanelCourse(String CourseNo, String CourseName, String CourseCredit) {

    this.CourseNo = CourseNo;
    this.CourseName = CourseName;
    this.CourseCredit = CourseCredit;

    Credit = Float.parseFloat(CourseCredit);

    if (Credit == 0.75) CreditIndex = 0;
    else if (Credit == 1.50) CreditIndex = 1;
    else if (Credit == 3.00) CreditIndex = 2;
    else CreditIndex = 3;

    DEPC = new JDialog();
    DEPC.setTitle("Course Edit Dialog");

    Panel =
        new JPanel() {
          protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawImage(
                new ImageIcon(getClass().getResource("/Icons/8.jpg")).getImage(),
                0,
                0,
                600,
                230,
                null);
            ButtonBorder.paintBorder(this, g, 172, 136, 130, 25);
          }
        };
    Panel.setForeground(Color.WHITE);
    Panel.setLayout(null);

    CourseNoLabel1 = new JLabel("Course No.          : ");
    CourseNoLabel1.setForeground(Color.WHITE);
    CourseNoLabel1.setFont(new Font("Rockwell Extra Bold", Font.PLAIN, 12));
    CourseNoLabel1.setBounds(77, 29, 139, 27);
    Panel.add(CourseNoLabel1);

    CourseNoLabel2 = new JLabel(this.CourseNo);
    CourseNoLabel2.setForeground(Color.WHITE);
    CourseNoLabel2.setFont(new Font("Rockwell Extra Bold", Font.BOLD, 12));
    CourseNoLabel2.setBounds(213, 29, 200, 27);
    Panel.add(CourseNoLabel2);

    CourseNameLabel = new JLabel("Course Title       :");
    CourseNameLabel.setForeground(Color.WHITE);
    CourseNameLabel.setFont(new Font("Rockwell Extra Bold", Font.PLAIN, 12));
    CourseNameLabel.setBounds(77, 56, 139, 26);
    Panel.add(CourseNameLabel);

    CourseNameField = new JTextField(this.CourseName);
    CourseNameField.setForeground(Color.WHITE);
    CourseNameField.setFont(new Font("Rockwell Extra Bold", Font.PLAIN, 10));
    CourseNameField.setBounds(213, 60, 200, 20);
    CourseNameField.setOpaque(false);
    CourseNameField.setHorizontalAlignment(SwingConstants.CENTER);
    Panel.add(CourseNameField);

    CourseCreditLabel = new JLabel("Course Credit   :");
    CourseCreditLabel.setForeground(Color.WHITE);
    CourseCreditLabel.setBounds(77, 87, 139, 26);
    CourseCreditLabel.setFont(new Font("Rockwell Extra Bold", Font.PLAIN, 12));
    Panel.add(CourseCreditLabel);

    CourseCreditBox = new JComboBox<String>();
    CourseCreditBox.setBackground(Color.GRAY);
    CourseCreditBox.setForeground(new Color(28, 0, 0));
    CourseCreditBox.setBounds(213, 91, 103, 20);
    CourseCreditBox.setBorder(ButtonBorder);
    CourseCreditBox.addItem("0.75");
    CourseCreditBox.addItem("1.50");
    CourseCreditBox.addItem("3.00");
    CourseCreditBox.addItem("4.00");
    CourseCreditBox.setMaximumRowCount(3);
    CourseCreditBox.setSelectedIndex(CreditIndex);
    Panel.add(CourseCreditBox);

    UpdateButton = new JButton("Update");
    UpdateButton.setForeground(Color.WHITE);
    UpdateButton.setFont(new Font("Rockwell Extra Bold", Font.BOLD, 10));
    UpdateButton.setBounds(173, 137, 128, 23);
    UpdateButton.setContentAreaFilled(false);
    UpdateButton.addActionListener(this);
    Panel.add(UpdateButton);

    DEPC.getContentPane().add(Panel);
    DEPC.setSize(500, 230);
    DEPC.setLocation(500, 200);
    DEPC.setResizable(false);
    DEPC.setVisible(true);
    DEPC.setModal(true);
  }