Want to apply print functionality of google map in asp.net

Hello, I want to create print functionality of google map in my asp.net web application.

I use the following code for that,

"javascript">
var contents = window.opener.document.getElementById("dvMap");
document.write(contents.innerHTML);
window.print();
"button" value="Print" onclick="javascript:this.style.display='none';window.print();this.style.display='';" />

But while i am clicking on print button it will open print page but not show the map which i want to print,it show blank page.please refere following image.

https://ibb.co/bw1EvH

What is the solution?please suggest

Thanks.