After my linkbutton called the ashx the normal button onclick seems gone

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ASP.NET

event

ASHX

handler

Hello gents,

In an asp.net project I have a table to set parameters for a report.
After clicking button Generate the linkbutton Export to Excel will show up if the reports have records.
Generate will fill a GridView and that is showing fine.
linkbutton uses PostBackUrl to an ashx file.
In the ashx handler I retrieve the parameters and with ClosedXML an ExcelFile is created and can Chrome shows the download at the bottom of the browser.

Funny part now is that when I change my parameters and press Generate again, the ashx handler gets called.

How to overcome this?

What I have tried:

Read a lot on google about this issue. Even generating clientside of the excel calling the ashx over $.ajax does not work me.

How do I have the button event restored?