Wcf Service in 3-tier Architecture

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C#

ASP.NET

WCF

Hello Every one,


can you explain me about wcf service in 3-tier Architecture, it means how we can use wcf service in application.
In the service what we have to write either BAL(business access layer) or DAL(data access layer)

and which one is better can any one give structure or example....

please help me..........

Thanks