Web 服务和 Application 服务.NET Framwork 3.5 允许我们创建基于ASP.NET的WEB服务(.asmx)和基于WCF的Web服务供使用了AJAX库的Web页面的客户端脚本调用我们还可以调用包含在Web服务内部的的服务器Window服务。
You can also call server-based application services that are exposed as Web services, which includes forms authentication, roles management, and profiles. These application services can be consumed in WCF-compatible applications, which includes AJAX-enabled Web pages and Window Forms clients. As a result, applications that are built with these ASP.NET or WCF technologies can share information that is made available by application services. For more information
LINQ没有提供在多层应用程序中应用的功能,这一个功能可以通过序列化Expression Tree 来解决,Expression Tree 就可以通过Remoting或者WCF发布出去,正好有一个开源项目解决这个问题:http://www.codeplex.com/interlinq。这个项目也包含着上面所说的NHibernate.Linq.