Chris,   It's really a strange problem that it relative the PDF extension.   But I currently are not able to reproduce this problem.   Can you upload it to our online example ?   We need know which cause this issue, the browsers? or servers.   Regards, Terry

Hi, Currently the Uploader can't not be applied the validation control.   while the uploader would do a postback to server after it upload a file,   You can send a flag to client side after the file are uploaded.   Or you can check our online sample ...

ssjal ,   You can just create a new uploader and put it into some container , at every page's init/load event:    Uploader _uploader;  protected override void OnLoad(EventArgs e)  {   _uploader = new Uploader();   _uploader.ID = ''MyUploader'';   _uploader.InsertText = ''Select ...

Hi,   Please try   Uploader1.InsertButton.ValidationGroup = ''NoNeed'';   Some customers have the same problem , maybe we need improve the uploader for this condition automatically.   Regards, Terry

Hi,   Oh yes. Since we changed the uploader recently , we forgot to implement this sample method.   the AppendData method should be:   -old code deleted-see the following reply-   Please test it and reply me if you get more problem.     Regards, Terry.

Hi,   Is it convenient that your put an online exapmpe for me ? My email address is terry @ cutesoft.net I will help you to do some tests.   Thanks   Regards, Terry

Chris,   That is a Silverlight plug-in error.   As you said it's just happen in a few chance, and there's no enough debug information,   Maybe we need investigate it for a long time.   Could you tell me , when you get such error ?   When click the browse button ? or after selecting a file ? or while uploading ...

Chris,   Can you show me the code of the update button ?   When you move/delete the file , you should call the attachment item's Delete method.   Regards, Terry

veloearl,   We will invesgating on this issue more deeply.   Regards, Terry

Hi,   Currently Flash-plugin is not support your case.   If the browsers installed Flash, the Uploader would try to use Flash to upload,   And then the Flash would prompt the username/password.   We already provide a method to just disabled the Flash mode ...