why it is converting to xps

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C#

C#4.0

jQuery

$("#convert").click(function printPartOfPage(jqxChart) {
var printContent = document.getElementById('jqxChart');
var gridcontent = document.getElementById('jqxgrid');
var windowUrl = 'about:blank';
var windowName = 'Print';
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();
});

unable to convert to pdf it is saving as xps file.Please anyone could help me.
Can anyone help me to convert to pdf