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My open source Ajax Start Page www.dropthings.com has an ASP.NET Ajax Extender which provides multi-column drag & drop for widgets. It allows reordering of widgets on the same column and also drag & drop between column. It also supports client side notification so that you can call web service and store the position of the widgets behind the scene without (async) postback.

I first thought of going for a plain vanilla Javascript based solution for drag & drop. It requires less code, less architectural complexity and provides better speed. Another reason was the high learning curve for making Extenders in proper way in Asp.net Ajax given that there’s hardly any documentation available on the web (during the time of writing this blog). However, writing a proper extender which pushes Asp.net Ajax to the limit is a very good way to learn under-the-hood secrets of Asp.net Ajax framework itself. So, the two extenders I will introduce here will tell you almost everything you need to know about Asp.net Ajax Extenders.