CodeIgniter Downloading file does not work and does not give an error


I am trying upload file from CodeIgniter. File not giving any error and even not storing file in uploads folder whic is in root directory or codeigniter. Can somebody help ? Please note as i already gave 755 permission to my uploads folder. below is my code

view file

<title>Upload Form</title>

<?php echo $error;?>

<?php echo form_open_multipart('UploadController');?>

<input type="file" name="userfile" size="20" />

<br /><br />

<input type="submit" value="upload" />



Below is my controller


class UploadController extends CI_Controller {

    function __construct()
        $this->load->helper(array('form', 'url'));

    function index()
        $this->load->view('uploadview', array('error' => ' ' ));

    function do_upload()
        $config['upload_path'] = './uploads/';
        $config['allowed_types'] = 'gif|jpg|png';
        $config['max_size'] = '100';
        $config['max_width']  = '1024';
        $config['max_height']  = '768';

        $this->load->library('upload', $config);

        if ( ! $this->upload->do_upload("add_1"))
            $error = array('error' => $this->upload->display_errors());

            $this->load->view('upload_form', $error);
            $data = array('upload_data' => $this->upload->data());

            $this->load->view('uploadview', $data);

please help me in this issue.

there are some mistakes in your code: Please changes on following lines:

1.change form_open_multipart('UploadController') to form_open_multipart('UploadController/do_upload')

2.change $this->upload->do_upload("add_1") to $this->upload->do_upload("userfile"). 3.change $this->load->view('upload_form', $error); to
$this->load->view('uploadview', $error);