java coding

plz correct this one ....i want to retrive data row from databse ...all its working but for combobox it not.......plz plz plz help me......

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) { 
if(jTextField1.getText().equals("")){
     JOptionPane.showMessageDialog(null,"Please enter the Student Name to search","Error",0);
 }
 else{
 try
        {
            String name=jTextField1.getText();

            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
         Connection con=DriverManager.getConnection("jdbc:odbc:college");

            Statement st=con.createStatement();
            ResultSet rs=st.executeQuery("select * from demo where name='"+name+"'");
            while(rs.next()){
            jTextField1.setText(rs.getString("name"));
            jComboBox1.setSelectedText(rs.getString("course"));
           jTextArea1.setText(rs.getString("address"));
            }

        }
        catch(SQLException sqlex)
     {
         System.out.println("SQLExceptionOccurred"+sqlex.getMessage());
     }
     catch(ClassNotFoundException cnfex)
     {
         System.out.println("ClassNotFoundExceptionOccurred"+cnfex.getMessage());
     }

    }
 }