Form Submit issue

[eluser]esenes[/eluser]
I have a form in my view file with two input fields and a submit button,if i click on the submit button how would i check it in controller...

i used the following

if(isset($this->input->post('submit')))
{

}
but i get the following error...

Fatal error: Can't use method return value in write context in D:\Projects\htdocs\my_ci\application\controllers\form_con.php on line 12

how would i use form submission in codeigniter..help me..