Reverse AJAX with IIS/ASP.NET

Can you suggest me some techniques/API's for doing a Reverse AJAX with ASP.NET? I checked WebSync, but thats too expensive, any free API's?

And I woul开发者_如何学编程d also be please to get some tutorials regarding the same..

Thanks a lot!

James, Comet is the name of the technique and not a specific code.

Check this sites for comet with asp.net

http://www.frozenmountain.com/websync/

or

http://www.aaronlerch.com/blog/2007/07/08/creating-comet-applications-with-aspnet/

PokeIn gives you an enhanced JSON functionality to make your server side objects available in client side. Simply, it is a Reverse Ajax library which makes it easy to call JavaScript functions from C#/VB.NET and to call C#/VB.NET functions from JavaScript. It has numerous features like event ordering, resource management, exception handling, marshaling, Ajax upload control, mono compatibility, WCF & .NET Remoting integration and scalable server push.

There is a free community license option for this library and the licensing option is quite cost effective in comparison to others.

There is a free edition of Lightstreamer - you'd have to look at the feature list though. http://www.lightstreamer.com/products.htm