WPF DocumentViewer падает при прокрутке вниз для предварительного просмотра второй страницы документа XPS

TRY THIS

controller

function Act_AddProducts() {
$product_rate = $data = array();

$product_rate = $this->input->post( 'prodrate' );
$product_name = $this->input->post( 'prodname' )
        if ( !empty($this->input->post( 'prodname' ))&&!empty($this->input->post( 'prodrate' ))) {
            foreach ( $product_name as $key => $value ) {
            $data['product_name'] = $value;
            $data['product_rate'] = $product_rate[$key];
                $this->ProductModel->add_products($data);
            }

        }

model

      function add_products($data)
  {
        $product_name = $data['product_name'];
        $product_rate = $data['product_rate'];
      if($this->db->insert('tbl_product_master', array('product_name' => $product_name,'product_rate' => $product_rate)))
      {
        return true;
      }
      else
      {
        return false;
      }
  }