I want to show a message when ajaxToolkit:AjaxFileUpload start uploading, is there a way to do this
问题 I want to a message when ajaxToolkit:AjaxFileUpload start uploading, is there a way to do this 回答1: By default AjaxFileUpload doesn't have such event. But as the AjaxControlToolkit is an open-source library, you can add it yourself. Download the recent library sources from this page: source codes, find out AjaxFileUpload control sources (/Server/AjaxControlToolkit/AjaxFileUpload folder) and add code below to the AjaxFileUpload.cs file: [DefaultValue("")] [Category("Behavior")]