Hi,
You can do that by 2 ways :
1 - in FileUploaded event , you can use Uploader uploader=(Uploader)sender; use uploader.Parent to get the ListViewItem and then find the textbox.
2 - you can use UploadPersistedFile/UploadAttachments to hold the uploaded file, and in the ItemUpdating event, use uploader.File/Items to get the uploaded files , do not need FileUploaded event.
Regards,
Terry