please wait dialog & downloading files asp.net


in asp.net concentration i have requirement user clicks an ui component beget pdf download. now implemented doing form post an ashx page. page radically inspects form following executes repremand server side page presumably law html pdf request pages html.



on fan i know disrespectful going removing pdf html, the an html i open new window proceed form post window works well. the pdf i don't change aim form stays tide page.



this works, user presented save dialog, tide page altered lost.



the problem i have generating pdf takes anywhere 1-15 seconds. i wish popup greatfully wait dialog. displaying popup going easy, i am certain i know tie popup? popup div tide page.



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