my6solutions.com — Note: With ASP .NET MVC, jQuery is the more convenient method you could use to make Ajax calls. Ajax.NET is the first Ajax library for the .NET framework. Up until the day ASP .NET 3.5 was released, there was nothing quite like it. In ASP .NET 2.0, the UpdatePanel was introduced as a way to enable partial rendering on ASP .NET pages. UpdatePanels are quick to implement. However, the downside of it is its inefficiency. The viewstate of the page gets posted back as well! This gives you a bloated asynchronous request and basically defeats the purpose. original link