Form Handling In CodeIgniter

<?php

class Blog extends CI_Controller

{

    function index()

    {

        echo "<h1>Entry Your Blog</h1>";

        echo "<form method=\"post\" action=\"blog/insert\">";

        echo "<input type=\"text\" name=\"title\">";

        echo "<textarea name=\"content\"></textarea>";

        echo "<input type=\"submit\" value=\"Save\"/></form>";

    }

    function insert()

    {

        $title = $_POST['title'];

        $content = $_POST['content'];

        $data = array(

            'title'=>$title,

            'content'=>$content

        );

        $this->db->insert('article',$data);

    }

}