asp.net - How can I duplicate a gridview's header? -

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i want have duplicate gridview's header row after each 25 "normal" rows. i'd save option sort grid clicking on these columns. possible?

set allowsorting="true", if gridview has sqldatasource/objectdatasource.

and need set sortexpression="fieldname" columns

<asp:boundfield datafield="" headertext="" sortexpression="fieldname" />

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