Hello,

I got an interesting problem today. When FileUpload control is placed in an UpdatePanel, HasFile property is always false. It is not only the HasFile property which is false but also other attributes like file name and length are set to blanks and zeros.

If the FileUpload control is pulled out of UpdatePanel, the problem is solved.

Can anyone please tell me how to make FileUpload controls to work with UpdatePanels?

Cheers,

Gopi

 

The FileUpload control doesn't work with an asynchronous postback, such as the UpdatePanel causes. From MSDN:

Using the FileUpload Control in Partial-Page Updates

The FileUpload control is designed to be used only in postback scenarios and not in asynchronous postback scenarios during partial-page rendering. When you use a FileUpload control inside an UpdatePanel control, the file must be uploaded by using a control that is a PostBackTrigger object for the panel. UpdatePanel controls are used to update selected regions of a page instead of updating the whole page with a postback. For more information, see UpdatePanel Control Overview and Partial-Page Rendering Overview.

FileUpload control are not compatible with Update Panel when they are used to upload files as part of an asynchronous postback.  

http://asp.net/ajax/documentation/live/overview/UpdatePanelOverview.aspx

Try to use <input type= "File" id="fileUpload" name="fileUpload" />

See here building AJAX enabled File Upload control

http://aspalliance.com/1442_Building_AJAX_Enabled_File_Uploading_System_with_Progress_Bar_Using_ASPNET_20.all

http://geekswithblogs.net/rashid/archive/2007/08/01/Create-An-Ajax-Style-File-Upload.aspx

http://msmvps.com/blogs/luisabreu/archive/2006/12/14/uploading-files-without-a-full-postback.aspx

http://blogs.infragistics.com/blogs/tony_lombardo/archive/2007/04/09/file-uploads-where-s-the-ajax.aspx

http://www.codeproject.com/KB/aspnet/AJAXUpload.aspx

http://forums.asp.net/t/1207035.aspx