Basics cpncepts of WCF

Windows Communication Foundation (Code named Indigo) is a programming platform and runtime system for building, configuring and deploying network-distributed services. It is the latest service oriented technology; Interoperability is the fundamental characteristics of WCF. It is unified programming model provided in .Net Framework 3.0. WCF is a combined feature of Web Service, Remoting, MSMQ and COM+. WCF provides a common platform for all .NET communication.

Advantages of WCF

     a)    WCF is interoperable with other services when compared to .Net Remoting where the client and service have to be .Net.

     b)    WCF services provide better reliability and security in compared to ASMX web services.

     c)    In WCF, there is no need to make much change in code for implementing the security model and changing the binding. Small changes in the configuration will make your requirements.

     d)    WCF has integrated logging mechanism, changing the configuration file settings will provide this functionality. In other technology developer has to write the code.

Following is good reference link to start create sample for WCF. 
http://www.aspdotnet-suresh.com/2011/06/introduction-to-wcf-wcf-tutorial-wcf.html

http://www.codeproject.com/Articles/29475/Windows-Communication-Foundation-FAQ-quick-starter#WhatisNET3