Print A Asp.net Page Without Showing pop up Page

<button onclick="printPage()">print</button>
<div id="printerDiv" style="display:none"></div>
<script>
   function printPage()
   {
      var div = document.getElementById("printerDiv");
      div.innerHTML = '<iframe src="mypage.aspx" onload="this.contentWindow.print();"></iframe>';
   }
</script>