You can achieve this using the jquery Library
jquery Library
and
Jquery Plugin
Write this....
<head>
<title>Invoice</title>
<script src="AdminPanel/js/jquery-1.11.1.min.js" type="text/javascript"></script>
<script src="js/jquery.PrintArea.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#print_button").click(function () {
$(".PrintArea").printArea();
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="PrintArea">
</div>
</form></body>