When AjaxFileUpload post back it takes your page URL and appends onto the end of it it's own query strings (contextkey and guid). This works fine if your page URL doesn't already contain any query strings but if it does then you end up with a URL that contains two question marks which then corrupts your own final query string value and this in turn stops the upload from working.
Comments: Hi. I used "AJAX Control Toolkit is June 2012". I found this bug, so I tryed the 3 DLL on this page. I downloaded it and replace files in my BIN folder, but the problem still in my app. This DLL are ok with June 2012 toolkit? What I forgot to use it? thanks
Comments: Hi. I used "AJAX Control Toolkit is June 2012". I found this bug, so I tryed the 3 DLL on this page. I downloaded it and replace files in my BIN folder, but the problem still in my app. This DLL are ok with June 2012 toolkit? What I forgot to use it? thanks