AjaxControlToolkit's AsyncFileUpload misbehaving when deployed online

Question

In case it matters, the following is inside a toolkit popup, which has an update panel in it.

<p>
    <asp:Label Text="Picture" runat="server" Width="75"></asp:Label>
    <ajaxToolkit:AsyncFileUpload ID="MediaPicture" runat="server" Width="200"
        OnClientUploadStarted="BlockSubmits" ClientIDMode="AutoID"
        OnClientUploadError="UnblockSubmits" PersistFile="true"
        OnClientUploadComplete="UnblockSubmits" 
    />
</p>

The javascript functions just block / release a submit button, to prevent problems during uploads.

This works fine on localhost, but when deployed online on a GoDaddy server, I can't seem to upload files over a few KB, even when locally I could upload bigger files (~2MB)...

I can't seem to find the reason for this behavior, could it be on the IIS? I read something about the app pool clearing before the upload could complete, could this be happening?

Btw, just in case, server-side I just take the picture out of this control

byte[] picture = MediaPicture.FileBytes ?? (string.IsNullOrEmpty(mediaID) ? null : Media.SelectByID(int.Parse(mediaID)).GetPicture());

There's some extra logic in there about whether I'm in edit mode or not, and if the current record has a picture, I'll take that over no picture,

And then I store it on the database.

any thoughts as to why this might be happening?

thanks!

Answer 1

If I understand your situation correctly, the problem is caused by the AsyncFileUpload being located inside the updatepanel, thereby having the file upload happen during a postback...

This blog post has a decent explanation of why.

As for why it works locally, if it is the problem as explained above, it's because of the way the browser handles "local" from "internet" domains.