FileUpload in UpdatePanel

Want to include a FileUpload in UploadPanel using Ajax-enabled ASP .NET WebForms?

You need to do two things:

  • Set encoding type to the form element to multi-part: <form … enctype=”multipart/form-data”>
  • Add a non-async postback trigger on the UpdatePanel for the button that you want to read the uploaded file stream on: <asp:UpdatePanel …>…<Triggers>…<asp:PostBackTrigger ControlId=”Button”/></Triggers></asp:UpdatePanel>
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About Sorin Dolha

My passion is software development, but I also like physics.
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