UltimateAjax is an ASP.NET control to avoid unnecessary page reloads on your website. AJAX (Asynchronous JavaScript And XML) improves interactivity by refreshing only a partial area instead of the entire page. Create responsive Web pages that interact with the server behind the scenes. Minimize the load on your web server. Provide a better user experience by updating the information on your pages quickly. Save the latest page state by keeping the values of all form elements and viewstate. Supports .NET 1.1, 2.0 and 3.5.