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WebUpload -

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?