validation error in Codeigniter - php

Question

May I know why my insert function will display the validation message first even i do not insert any data yet.once I enter the insert page,it display the validation message.i have try to move the form validation to the below of the if else statement,it do not show the validation message but it cannot submit the data to the database. below is my controller function.
public function Insert_Result($Course_ID=null)
{
$this-load-helper('form');
$this-load-library('form_validation');
/* Model */
$this-load-model('ResultEvaluation');
/* Session */
$session_data = $this-session-userdata('logged_in');
$data['Ins_ID'] = $session_data['Ins_ID'];
$this-session-set_userdata($data);
/* Form Validation*/
//$this-form_validation-set_rules('Course_ID', 'Course_ID', 'required');
$this-form_validation-set_rules('Matric_No', 'Matric_No','required');
$this-form_validation-set_rules('Student_Name', 'Student_Name', 'required');
$this-form_validation-set_rules('Result_Mark_1', 'Result_Mark_1', 'required');
$this-form_validation-set_rules('Result_Mark_2', 'Result_Mark_2', 'required');
$this-form_validation-set_rules('Result_Mark_3', 'Result_Mark_3', 'required');
$this-form_validation-set_rules('Result_Mark_4', 'Result_Mark_4', 'required');
$this-form_validation-set_rules('Result_Mark_5', 'Result_Mark_5', 'required');
if ($this-form_validation-run() === FALSE)
{
$data['results'] = $this-ResultEvaluation-get_record();
$data['query'] = $this-ResultEvaluation-view($Course_ID);
$this-load-view('templates/header');
$this-load-view('Insert_Result', $data);
$this-load-view('templates/footer');
}
else
{
$my_action = $this-input-post('submit');
if ($my_action == 'Submit')
{
$this-ResultEvaluation-insert_record($Course_ID);
redirect('Result_Evaluation/Student_Result_List/'.$Course_ID,
'refresh');
}
}
$my_action = $this-input-post('submit');
if ($my_action == 'Cancel')
{
redirect('Result_Evaluation/Student_Result_List/'.$Course_ID,
'refresh');
}
}

Answer 1

I think this should help
public function index(){
$this->load->library(array('form_validation'));
$this->form_validation->set_rules('field_name', 'Text','trim|required');
if($this->form_validation->run()==TRUE){
// do something
}else{
// validation error
redirect("to/your/controller");
break;
}
}
for more information visit : http://ellislab.com/codeigniter/user-guide/libraries/form_validation.html