private void btnChangePwdActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnChangePwdActionPerformed
        // TODO add your handling code here:
        String op = tbxOldPwd.getText().replace("'", "");
        String np = tbxNewPwd1.getText();
        if (np.contains("'"))
        {
            tbxError.setText("Invalid charactor found.");
            return;
        }
        if (!np.equals(tbxNewPwd2.getText()))
        {
            tbxError.setText("Password confirmation failed.");
            return;
        }
        User_Controller UC = new User_Controller("localhost", DBName, DBAccount, DBPwd);
        if (UC.ChangePassword(ThisUser.UserID, op, np))
        {
            tbxError.setText("Password changed succeccfully.");
            tbxOldPwd.setText("");
            tbxNewPwd1.setText("");
            tbxNewPwd2.setText("");
        }
        else
        {
            tbxError.setText(UC.err);
        }
    }