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page event

Posted By:      Posted Date: October 08, 2010    Points: 0   Category :Windows Application
i prompt another popup form when clicking a button
in page_load of  popup Form,i call another namespace's class to export a lot of data
but i don't know why when i prompt popup Form from parent form
it display the form after the page_load event?
how can i prompt a popup form first and then execute to call another class in popup Form?

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