can not found css directory in wordpress header

hi guys i am beginner in wordpress i am trying to give path of my css file in header.php i am i trying this but i can not link my css file in my header.php is there any problem in my code i can not found my css file in page source.

<link rel="stylesheet" id="jquery-ui-theme-css" href="<?php echo get_template_directory_uri(); ?>/css/jquery-ui_002.css" type="text/css" media="all">