Rob Nagel ,

 

the order of the events are :

 

client side select multiple files

client show file1 uploading

server fire FileValidating event

client show file1 finish

client show file2 uploading

server fire FileValidating event

client show file2 finish

...

client side fire Postback event

server side fire FileUploaded event for each file

server side fire UploadCompleted event

 

If you move/delete the temp file in FileValiding event, the FileUploaded of that file will not fire.

 

So you can resize the image , but please keep the filepath , and then move it in FileUploaded event.

 

Regards,
Terry