Using version 19.1 of web controls in Visual Studio 2017...
I have a webupload control on a page and can not access the text property value of one of my textbox controls on the page inside UploadFinished. This particular textbox is the only one on the page that hasn't previously gone through a postback but yet after the upload is finished the value is still in the textbox. It's just the text property shows nothing ( "" ) in code behind in debug mode.
Can you please shed some light on why this might be? Does webupload use async postback (partial postback) or something like that?
I further tested by populating the textbox, forcing a postback before uploading the doc, then field's text value was accessible in UploadFinished. I'll rework my design.
I was currently looking into this matter for you and I was about to suggest a similar approach. I am glad that you managed to resolve your issue.
Please let me know if you need any further information regarding this matter.