Updatepanel postback trigger problem

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C#2.0

C#

Hi to all...


To overwrite the operation of updatepanel in masterpage i have used one more updatepanel in
content page.which contains 2 buttons one for saving , another for updating record in database..and one fileupload control.For triggering buttons action i have written code like this

<trigger><asp:PostBackTrigger ControlID="Button1"/>
<asp:PostBackTrigger ControlID="Button2"/>
But fileupload's Has property is true for only Button1 ,Its always false for Button2.Programatically it is inserting All fields & image into database but updation is happening only for fields, its not updating image..What will be the solution for this problem..

Answers will be appreciated..

Thanku :-)