form validation help

I'm going through the users guide tutorial over form validation but i wanted to add my own form validation. First of all, does the form validation code go inside the controller? second what am i doing wrong here? I just want to check to see if the username of the field was entered as Bob...if not reload the page, if so go to google. Heres my controller script

class Form extends Controller {

    function index()
        $data['title'] = "My Form Title";
        $data['heading'] = "My Form Heading";

        if($_POST['usernmae'] !== "Bob")
        $this->load->view('form_view', $data);


yes the form validation code goes inside the controller
and don't use $_POST it isn't very secure

This is not an example of form validation, you can do this without the library.

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