I need to have an update occur on the backend every time the user changes a value in a ASP.NET DropDownList control. I want to do this using AJAX so the browser does not do a total refresh and reposition the user off of the control they are currently on. My issue is that the user is performing a lot on input on this one page so I want to auto save with each change. I am running into issues where the Session State is timing out and the user loses all their changes. I tried changing the timeout setting in the web.config but that didn't work. Therefore, I want to make an AJAX callback as each DropDownList control is changed. How would that be done? I am not currently using Ajax anywhere in the website.
Try putting your DropDownList inside an UpdatePanel.