Validation within the controller

I have done all the validation in model. I have use
var $validate = array(
'ContactName' => array('length' => array('rule' => array('between',
3, 10),'message' => 'First Name cannot be blank or less than 3
characters.')),
'ContactEmail' => array('email' => array('rule' => 'email','message'
=> 'Please supply a valid email address.')),
'ContactPassword'=>array('ContactPassword'=>array('rule' =>
'notEmpty','message'=>'Password cannot be blank.')),
'ContactMsg' => array('ContactMsg' => array('rule' =>
'notEmpty','message' => 'Comments cannot be blank.'))
);

But I need to do it in controller. Please help me to do so.

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