Anthem.NET : Extension Samples : ProgressBar (source)

ProgressBar Demo Page

The ProgressBar is a control that is able to report real-time progress of a server-side process's progress. This works as follows: a server-side method is executed repetitively and returns the current progress of the work that is done on the server. This could be a very slow database query, or heavy data computing, for example. The example is tested in IE 6.0+ and FF 1.x+ on PC, and FF 1.x+ and Safari 1.2/2.0 on Mac.

ProgressBar

Just click on the button and the progressBar will start to fill. Note that the status line is also used to reflect that work is being done on the server.