Remove unwanted widgets from the WordPress Dashboard. Copy into your theme's functions.php file.

gistfile1.php

//Remove unwanted widgets from Dashboard
function remove_dashboard_widgets() {
  global$wp_meta_boxes; 
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
}
add_action('wp_dashboard_setup', 'remove_dashboard_widgets');