These days in developing Web 2.0 applications, how to locally update a web page becomes one of the most crucial and interesting topics. In this article from the point of view of an ASP.NET 2.0 developer, I will show you four different ways to achieve this goal with concrete examples.

In fact, there have already been several techniques coming into the locally updating stage before the term "AJAX" was coined.  Now let us first start researching into the IFrame approach.