Problem With "FileUpload" and "UpdatePanel"


I Have a problem with FileUpload and UpdatePanel.

when i use an Update Panel in a page, Control "FileUpload" Doesn't Work Correctly.

but when i remove UpdatePanel, Problem will Resolve.

UpdatePanel Placed in MasterPage, so i can't remove it, cause i'll should Place an UpdatePanel in each Page. It's almost impossible.

and, FileUpload is placed in a FormView.
when I click on "Upload" Button (that I Created for Upload selected  file) , Selected File will remove and file will not Upload.

So, now what i have to do? is it possible to Use both "UpdatePanel" and "FileControl"

2/24/2009 4:05:57 PM 13973 articles. 1 followers. Follow

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due to asynchronous post back of update panel FileUpload.HashFile always gives false.

so you have to use trigger to resolve this. follow this link that how to define trigger.

<asp:UpdatePanel runat="server" id="UpdatePanel1">
            <asp:FileUpload runat="server" id="FileUpload1" />
            <asp:Button runat="server" id="btnSubmit" Text="Upload" />
            <asp:postbacktrigger ControlID="btnSubmit" />


Let me know if u have any confusion 

Vinay Kumar Gupta

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2/24/2009 5:03:49 PM

 put trigger on the uploadbutton like(bold):

<asp:UpdatePanel runat="server" id="UpdatePanel1">
<asp:UpdatePanel runat="server" id="UpdatePanel1">
            <asp:FileUpload runat="server" id="FileUpload1" />
            <asp:Button runat="server" id="btnSubmit" Text="Upload" />
            <asp:postbacktrigger ControlID="btnSubmit" />


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Please mark the most helpful reply/replies as “Answer”.
2/24/2009 5:48:42 PM


Please refer to the following link :  .

Pawan Mishra
“The greatest compliment that was ever paid to me was when one asked me what I thought, and attended to my answer.” - Henry David Thoreau
2/25/2009 5:52:07 AM

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