Olaf,

 

Hope you can test it in a simple environment, not in your project.

 

And then try the args.Delete();

 

If it works for simple environment, that means there maybe something special which prevent the uploader release the temp file.

 

If it's a bug of AjaxUploader , we will fix it.

 

 

You can also test the UploadType property ,set it to IFrame/Silverlight/Flash and test again.

 

If we get more details , we can fix it more quickly.

 

Regards,

Terry