Hi

I'm developing a project in ASP.NET C#, with SQL Server Express 2005, on Windows Vista.

I have a GridView, and a DetailsView on an aspx page.

The GridView displays all items in a database that has a certain ProductID (The items is Pictures)

The DetailsView displays the selected row of the GridView.

In the DetailsView I have 3 FileUpload controls, for 3 different size of images.

My update functionallity works just fine. I catch the OnUpdating event of it's ObjectDataSource, and uses FindControl to get each FileUpload Control, and executes the FileUpload.SaveAs() method if the user provided a new Image.

My problem occurs when I want to Insert a new image. No matter what - all my FileUpload's HasFile property is always false.

I was trying different things, and then I removed the UpdatePanel from the page. That solved my problem, but I really want to use the UpdatePanel. What I found really strange is, that the code very much identic to the code for inserting, works fine when I'm updating.

I use kind of the same idea as provided in this: http://www.asp.net/Learn/DataAccess/tutorial56cs.aspx?tabid=63 article. I just have an UpdatePanel arround both the GridView and DetailsView.

Any ideas on what might be wrong?

OnUpdating

An upload control cant work with an update panel. Because it has to force a postback to give back the posted file... you can force a postback of the upload control by using  :

                     <Triggers>
                       <asp:PostBackTrigger ControlID="Upload1" />
                     </Triggers>

and force a postback for the upload control. Good Luck!

My FileUpoad control is placed inside a DetailsView.

 Therefore, you cannot reference the control by it's ID in the Triggers section.

This throws an exception:

A control with ID 'fi1' could not be found for the trigger in UpdatePanel 'UpdatePanel1'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: A control with ID 'fi1' could not be found for the trigger in UpdatePanel 'UpdatePanel1'.

Is there another way to reference it?

A quick way round this is to put a button outside of the datalist with visible set to false.

when the page loads, the datalist buttons have not yet been rendered

See the online documentation which controls are not compatible with UpdatePanel

http://ajax.asp.net/docs/overview/UpdatePanelOverview.aspx

I am working in asp and I need  inserted an image in detailview.  I've used fileupload but read error. Help please. 

Thanks

I am facing the same problems....anyone could help!!!~

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

I'm in the same boat and have been stuck on this issue for about 8 hours now.  If anyone has a solution please let me know.  I'm getting the PostBack trigger to work fine, but the FileName property on the FileUpload control is still empty.  By the way, here's how I got the trigger to work.  This is a usercontrol that contains a detailsview with a fileupload control inside of it.  The UpdatePanel is on the page.

First, I added an OnItemCreated event to the details view.

if (btnSave != null)

http://vinayakshrestha.wordpress.com/2007/03/31/ajax-extensions-file-upload-workaround/

MS's Joe Stagner recently did a series of videos on the FileUpload, including one on an Ajax-style file upload:  http://www.joeon.net/post/2008/02/New-4-part-series-of-videos-on-DOWNLOADING-with-ASPNET.aspx

http://forums.asp.net/t/1105208.aspx

I finally gave up.  I was able to get the FileUpload control working from a usercontrol inside a page that inherited a master page.  However, it just wouldn't seem to work from inside a detailsview.  It seems that adding the trigger in the ItemCreated event wasn't working. 

I Solved it.

As Hank adviced we should add the following:

<Triggers>
   <asp:PostBackTrigger ControlID="fileUpload1" />
</Triggers>

This works perfect whenever the FileUpload control is a child control of the UpdatePanel's ContentTemplate.

However when the FileUpload control is a child control of e.g. a DetailsViews, which is a child control of the UpdatePanel's ContentTemplate, we should not postback the FileUpload control but it's container.
So in this case you would have to postback the DetailsView by using it's ID.

<Triggers>
   <asp:PostBackTrigger ControlID="detailsView1" />
</Triggers>