'Web application - HttpResponseBase.AddHeader

I have a web application that uses HttpResponseBase.AddHeader. I'm using this method to download a .csv file:

.AddHeader("content-disposition", "attachment; filename=" + fileName64)

The problem is that this method stops my code flow. All code after this call is not running.

I need to be able to download this file and show the client a success message, I can't because this request stops everything.

Any suggestions please?

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