Hi All,
I have a problem in my jdialog(child) and the parent frame is jframe,it is taking two events to close the jdialog,both from the close caption available at the upperright corner of the dialog,as well as from the button add where i have used dipose() to close on single mouse event after adding the value in a database. i am enclosinga code here

package ERP;

import com.mysql.jdbc.ResultSet;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 *
 * @author rohtash
 */
public class Location extends javax.swing.JDialog {

    /**
     * Creates new form Location
     */

     Connection conn=null;
    ResultSet rs=null;
    PreparedStatement pt=null;
    public Location(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jDesktopPane1 = new javax.swing.JDesktopPane();
        jLabel1 = new javax.swing.JLabel();
        Location_text = new javax.swing.JTextField();
        jScrollPane1 = new javax.swing.JScrollPane();
        Address_Text = new javax.swing.JTextArea();
        jLabel2 = new javax.swing.JLabel();
        location = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle(org.openide.util.NbBundle.getMessage(Location.class, "Location.title")); // NOI18N
        setAlwaysOnTop(true);
        setBounds(new java.awt.Rectangle(30, 90, 0, 0));
        setResizable(false);

        jLabel1.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        jLabel1.setForeground(java.awt.Color.white);
        org.openide.awt.Mnemonics.setLocalizedText(jLabel1, org.openide.util.NbBundle.getMessage(Location.class, "Location.jLabel1.text")); // NOI18N

        Location_text.setText(org.openide.util.NbBundle.getMessage(Location.class, "Location.Location_text.text")); // NOI18N
        Location_text.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                Location_textActionPerformed(evt);
            }
        });

        Address_Text.setColumns(20);
        Address_Text.setRows(5);
        jScrollPane1.setViewportView(Address_Text);

        jLabel2.setFont(new java.awt.Font("Arial", 1, 12)); // NOI18N
        jLabel2.setForeground(java.awt.Color.white);
        org.openide.awt.Mnemonics.setLocalizedText(jLabel2, org.openide.util.NbBundle.getMessage(Location.class, "Location.jLabel2.text")); // NOI18N

        org.openide.awt.Mnemonics.setLocalizedText(location, org.openide.util.NbBundle.getMessage(Location.class, "Location.location.text")); // NOI18N
        location.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                locationActionPerformed(evt);
            }
        });

        org.openide.awt.Mnemonics.setLocalizedText(jButton2, org.openide.util.NbBundle.getMessage(Location.class, "Location.jButton2.text")); // NOI18N
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        org.openide.awt.Mnemonics.setLocalizedText(jButton3, org.openide.util.NbBundle.getMessage(Location.class, "Location.jButton3.text")); // NOI18N

        javax.swing.GroupLayout jDesktopPane1Layout = new javax.swing.GroupLayout(jDesktopPane1);
        jDesktopPane1.setLayout(jDesktopPane1Layout);
        jDesktopPane1Layout.setHorizontalGroup(
            jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDesktopPane1Layout.createSequentialGroup()
                .addGap(52, 52, 52)
                .addGroup(jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jDesktopPane1Layout.createSequentialGroup()
                        .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(9, 68, Short.MAX_VALUE)
                        .addComponent(Location_text, javax.swing.GroupLayout.PREFERRED_SIZE, 191, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jDesktopPane1Layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 191, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jDesktopPane1Layout.createSequentialGroup()
                        .addGap(13, 13, 13)
                        .addComponent(location, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(33, 33, 33)
                        .addComponent(jButton2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 63, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(39, 39, 39)))
                .addGap(37, 37, 37))
        );
        jDesktopPane1Layout.setVerticalGroup(
            jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDesktopPane1Layout.createSequentialGroup()
                .addGap(16, 16, 16)
                .addGroup(jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Location_text, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addGap(18, 18, 18)
                .addGroup(jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addGap(32, 32, 32)
                .addGroup(jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(location, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(jDesktopPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jButton3)
                        .addComponent(jButton2)))
                .addContainerGap())
        );
        jDesktopPane1.setLayer(jLabel1, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(Location_text, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(jScrollPane1, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(jLabel2, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(location, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(jButton2, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jDesktopPane1.setLayer(jButton3, javax.swing.JLayeredPane.DEFAULT_LAYER);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jDesktopPane1)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jDesktopPane1)
                .addGap(0, 0, 0))
        );

        pack();
    }// </editor-fold>                        

    private void Location_textActionPerformed(java.awt.event.ActionEvent evt) {                                              
        // TODO add your handling code here:
    }                                             

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        dispose();
    }                                        

    private void locationActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:

           try
        {

              Connection con=new DBConn().connect();

             String sql="INSERT INTO Location (Location1,Address) VALUES (?,?)";

            pt=con.prepareStatement(sql);
            pt.setString(1,Location_text.getText());
             pt.setString(2,Address_Text.getText());

            /*pst.setString(5, unitmeasureprice_jComboBox4.getText());*/
pt.execute();










        } 
        catch (SQLException ex) {
           ex.printStackTrace();
        }

         dispose();
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Location.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Location.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Location.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Location.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the dialog */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                Location dialog = new Location(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    @Override
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JTextArea Address_Text;
    private javax.swing.JTextField Location_text;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JDesktopPane jDesktopPane1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton location;
    // End of variables declaration                   
}

your help is highly apprectiable.thanks in advance

You are doing a potentially slow database connect + SQL operation inside your actionPerformed - ie on the Swing Event Dispatch Thread. That's going to stop all GUI activity while the SQL is happening and lead to an apparent lack of responsivness on the screen.

You should a start a SwingWorker or other thread to perform the database activities, and return from the actionPerformed immediately.

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