Sometimes, the requirements for a web application include a list of users that are currently logged-in. It would seem, at first glance, to be pretty trivial, but because few of us explicitly log out of web applications, the reality can get complicated. Even the best solution is a trade-off. Dino explains the issues and alternatives.… Read more
Microsoft's ASP.NET AJAX Extensions provide developers with a quick and simple way to add AJAX functionality into any ASP.NET Website. In this article, Dan Wahlin demonstrates how to use the UpdatePanel control, which performs asynchronous postback operations that update a portion of a page rather than the entire page itself. … Read more
The latest craze for mashups involves making cross-domain calls to Web Services from APIs made publicly available by companies such as Google, Flickr and so on. Unfortunately, the XMLHttpRequest object doesn't allow calls made in one domain to a web service in another.
The article surveys the current, somewhat unsatisfactory, solutions and then assesses future directions.
… Read more