Print part of page in asp.net

Print part of page in asp.net

 <script language="JavaScript" type="text/javascript">

        function printPartOfPage(elementId)
        {
         var printContent = document.getElementById(elementId);
         var windowUrl = 'about:blank';
         var uniqueName = new Date();
         var windowName = 'Print' + uniqueName.getTime();
         var printWindow = window.open(windowUrl, windowName, 'left=50000,top=50000,width=0,height=0');
         printWindow.document.write(printContent.innerHTML);
         printWindow.document.close();
         printWindow.focus();
         printWindow.print();
         printWindow.close();
         return true
        }
// -->
    </script>