The progress area does not disappear, because the page does not get reloaded, which in turn happens, because of the Response.End
call in the end of the method.
If your scenario need to have the Response.End
call, you can handle the OnClientProgressUpdating
event, where you can determine if the progress data is the last expected and use the hide()
method to hide the progress area.
Let me know if I am missing something.
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