[RESOLVED]how to set button inside panel is false in java script

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="printpage.WebForm1" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type = "text/javascript">
function PrintPanel() {
var panel = document.getElementById("<%=pnlContents.ClientID %>");

var printWindow = window.open(”, ”, ‘height=400,width=800′);

printWindow.document.write(‘<html><head><title>DIV Contents</title>’);
printWindow.document.write(‘</head><body >’);
printWindow.document.write(panel.innerHTML);
printWindow.document.write(panel.tagName);

printWindow.document.write(‘</body></html>’);
printWindow.document.close();
setTimeout(function () {
printWindow.print();
}, 500);
return false;
}
</script>
</head>
<body>
<form id="form1" runat = "server">
<asp:Panel id="pnlContents" runat = "server">
<span style="font-size: 10pt; font-weight:bold; font-family: Arial">Hello,
<br />
This is <span style="color: #18B5F0">Mudassar Khan</span>.<br />
Hoping that you are enjoying my articles!</span>
<asp:Button ID="btnPrint" runat="server" Text="Print" OnClientClick = "return PrintPanel();" />
</asp:Panel>
<br />

</form>
</body>
</html>

document.getElementById(‘<%= btnPrint.ClientID %>’).disabled = true; 

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