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May 03, 2012 06:17 AM|LINK
I think it is not neede to set it's visibility. When a request is sent by it's associated update panel it automatically appears until response is complete to that request. As response ended it automatically hides. But you can chage the update progess's appearece
time by it's property DisplayAfter. it is in miliseconds and detemines the time of appearing of update progress after a request is sent.