Post Back does not work after writing files to response in ASP.NET

Question

What I have?

I have an ASP.NET page which allows the user to download file a on a button click. User can select the file he wants from

Answer 1

Remove Response.End() and let the response end naturally within the ASP.NET ecosystem.

If that does not work, I would recommend putting the button in a separate

and post the required data to a separate HTTP handler. Setup the HTTP handler to export the XML instead of a web page.