Error Handler for Employee using Database Access and Netbeans

if(evt.getSource()==btnDelete){
            try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            Connection con = DriverManager.getConnection("jdbc:odbc:table1");
            Statement st = con.createStatement();
            int empno = Integer.parseInt(txtDelete.getText());
            
            ResultSet rs = st.executeQuery("SELECT * FROM Activity where employee_number='"+empno+"'");
                int i = st.executeUpdate("DELETE FROM Activity where employee_number ='"+empno+"'");
            
                while(rs.next()){
                    ResultSet.getInt(empno);
           
            JOptionPane.showMessageDialog(null, "Row is deleted");
            txtDelete.setText("");
             txtAdd1.setText("");
            txtAdd2.setText("");
            txtAdd3.setText("");
            txtAdd4.setText("");
            con.close();
            st.close();
                }
        }
        catch(Exception e){
            JOptionPane.showMessageDialog(null, "Data not found");
        }
        }
    }