Here Mudassar Ahmed Khan has explained how to show ASP.Net AJAX UpdateProgress in ASP.Net AJAX ModalPopupExtender Modal Popup style.
Just like the ASP.Net AJAX ModalPopupExtender Modal Popup, the ASP.Net AJAX UpdateProgress control is displayed in the center or middle of page with a modal background covering the whole screen and until the AJAX call is in progress, the screen will freeze and user will not able to perform any action.
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