c# - Response processing with ASP.NET functions -

i have function in c# code behind fires on button click. should change span "done", , if zipfile checkbox checked, fire off zip file user.

    process.text = "done";     if (zipfile.checked)     {         response.appendheader("content-disposition", "attachment; filename=" + foldername);         response.contenttype = "application/zip";         using (zipfile zip = new zipfile())         {             zip.adddirectory(server.mappath("pdfs")+"/"+foldername);             zip.save(response.outputstream);         }         response.end();     } 

if checkbox unchecked, done displayed. if zipfile checkbox checked, send zip file, no longer change process.text = done. response seems overwriting asp.net function return. first time using response, doing wrong.

in addition of setting text on server side, set on client side. try following snippet:

<script>     function btnprocessclicked() {         $('#<%= process.clientid %>').text("done");         return true;     } </script> 

however, in approach, remember if don't set text on server side in scenario (!zipfile.checked), span revert last server value after postback.