c# - CSV file is not downloading in asp.net because Respose.Write isn't working -

i'm creating csv file stringbuilderand i'm trying download file following code:

response.clear(); response.buffer = true; response.addheader("content-disposition", "attachment;filename=report.csv"); response.charset = "utf-8"; response.contenttype = "text/csv"; response.output.write(sb.tostring()); response.flush(); response.end(); 

i'been using same code in other projects no problem, in 1 when click export button code executed nothing happens, no exception, no error, nothing.

also try following: response.write(sb.tostring()); , "application/text" or application/csv

anyone can point me in right direction make work?

update

for reason don't understand yet, response.output.write or response.write not working because can't anything, not single string or javascript alert.

any idea?

remove line

response.flush(); 

because response.buffer = true.

and use

response.write(sb.tostring()); response.end();