Hi,

 

Please check the HTML code of this page http://ajaxuploader.com/Demo/Start-uploading-manually.aspx

 

in btnSave_OnClientClick, if call startupload(), you should return false to prevent the page submit.

 

and you need handle the CuteWebUI_AjaxUploader_OnPostBack event for submitting the form by the button again.

 

Regards,
Terry