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From the developer preview What’s New for ASP.NET 4.5 and Web Development it seems we get to use Websockets and Async Http methods,Handlers
Async is the best way to do long-running IO-bound operations: calling external network resources, long-running database queries, and so on. You should understand the pros and cons of asynchronous operations before using it. The main reason to use async operations in ASP.NET is to release the working thread while performing IO, to allow this thread to be used to process subsequent requests.
Websockets are used to send frequent server-to-client notifications and updates. Classic examples of such applications are web chat and stock ticker. There are some alternatives to websockets: Ajax long-polling and Comet, Flash/Java applets, Silverlight client with WCF duplex service.