Ajax problem with file upload controls and with triggers.

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C#

ASP.NET

i am trying to use ajax with on a page with file upload control..

earlier when i put the fileupload control in update panel.. it even not inserting the data. but after i used triggers. then data is inserted. but the purpose of ajax with add product buttion( which is inserting the data) is not working..

here is the way i introduce triggers in update panel

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <Triggers>
    <asp:PostBackTrigger ControlID="btnaddproduct" />
    
    </Triggers>

page should remain still but i think ajax script manager and update panel is not fullfilling there functionality . can anyone sort out the problem