How to implement a push-pull web application in c # asp.net

The data is either in files or in databases.

I want to implement data grids that will extract data from files (.h5, csv or xml) and sql server databases and show them in real time.

I do not want to use a timer with an interval of a few seconds. I want to implement push push technology in asp.net/c#/silverlight that I could use?

Please indicate how best to implement this, and if there are any libraries available that I can use?

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Comet. ( ).

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Websockets, , websocket , wiki

WebSocket Firefox 4, Google Chrome 4, Opera 11 Safari 5, Safari iOS 4.2. 1 , Firefox Opera,

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WCF - . SQL Server Service Broker SqlDependency. CLR procs, DB.

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