I need to print the exact size of barcode from client side using asp.net

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C#

ASP.NET

I want to print the barcode from barcode printer, the size of barcode label is 2.5cm in height & width is 5cm that is from client side.
Here my problem is, when ever I try to customize the size of the barcode, the window size is customizing not the barcode size that is present in document in windows.print().
I have tried a lot but I couldn't, here in below coding I tried to adjust the document size in window but window is not appearing when I click Print button.

Pls help to bring the exact document size in window & make it to print the barcode...

<asp:Button ID="btnPrint"  runat="server" ToolTip="Click Here to Print"
               OnClientClick="ClientSidePrint('divprint');"
               CssClass="add_btn" Text="Print" Height="25" />

               function ClientSidePrint(divBarcodeLabel) {
               var s = $find('MPE1');
               s.show();
               document.getElementById("subhead").style.display = "block";
               var w = 378;
               var h = 283;
               var l = (window.screen.availWidth - w) / 2;
               var t = (window.screen.availHeight - h) / 2;

               var sOption = "toolbar=no,location=no,directories=no,menubar=no,scrollbars=yes,width=" + w + ",height=" + h + ",left=" + l + ",top=" + t;
               // Get the HTML content of the div
               var sDivText = window.document.getElementById(divBarcodeLabel).innerHTML;
               // Open a new window
               var objWindow = window.open("", "Print", sOption);
               // Write the div element to the window
               objWindow.document.write(sDivText);
               objWindow.document.close();
               // Print the window
               objWindow.print();
               // Close the window
               objWindow.close();
           }