Dot net developers can ajaxify their application in several ways:
· using Update Panel from ajax control toolkit,
· using PageMethods,
· using WebServices(.asmx file),
· using WCF Services(.svc file using JSON),etc
Learn ajaxifying using update Panel(simple ajaxify) and by PageMethods(little less handy but much more flexible) here:
www.ritechsoft.in/ajax-with-aspnet.html