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Home/ Questions/Q 3347060
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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T01:22:37+00:00 2026-05-18T01:22:37+00:00

Referring to the following: Ajax Asyncfileupload doesn’t work as soon as I put it

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Referring to the following:
Ajax Asyncfileupload doesn’t work as soon as I put it in a control

I am having the same issue. I am not using a Master page though. I have an AsyncFileUpload control in a Panel, within an update panel.

Any ideas as to what could be causing the issue?

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  1. Editorial Team
    Editorial Team
    2026-05-18T01:22:38+00:00Added an answer on May 18, 2026 at 1:22 am

    When you use AsyncFileUpload you must set the right params in the form tag, that is placed in your Page or MasterPage:

     <form id="form1" runat="server" enctype="multipart/form-data" method="post">
    

    If you don’t set the right enctype and method UploadedComplete will never fire, and you won’t be able to get FileUpload.FileBytes since FileUpload.HasFile returns true only during UploadedComplete execution.

    I suppose that in your page you haven’t set the right enctype.

    Besides, prevoius versions of AsyncFileUpload didn’t work on Chrome. 2011 July version (4.1.50731.0) solved the problem.

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