How redirect new page after start downloading

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ASP.NET

Javascript

file

Hi,
I want to redirect to my website homepage after start of downloading the file how to redirect please tell me..
I am using below code for download file and open the my website homepage , file is downloading but
after start of downloading file my website is not opening.

Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment; filename=Sholatours_HowToGetTheBestOutOfYourVacation_FreeEbook.pdf");

Response.TransmitFile(Server.MapPath("~/LandingPages/img/Sholatours_HowToGetTheBestOutOfYourVacation_FreeEbook.pdf"));
Response.End();