file up-loader blank when update panel refresh

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i have a file upload button, and a update panel just below it,
but my problem is whenever update panel is refresh my uploaded file in file upload is also refresh and file uploder is blank,
i put file uploder in any place at the page, but after this i face the same problem, that file blank every time, if update panel is refresh,
so plz help me,

Posted 6-Dec-12 22:34pm

Arun kumar Gauttam

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VishwaKL 7-Dec-12 4:38am

use trigger to fix it

Arun kumar Gauttam 7-Dec-12 4:47am

how we use trigger in that case

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Zafar Sultan · Answer 1 · 2012-12-06T22:41:00

File Upload Control do not maintain state during postback. That is the default behaviour by design as far as I know. In order to maintain the state(the selected file) you have to make a workaround just like gmail does whaen you attach multiple files. Google the solution and you will have plenty of solutions. Or, when you are already using update panels, why not to make use of the asyncfileupload control?