WCF Tutorial
Windows Communication Foundation (WCF) is a framework for building service-oriented applications. Using WCF, you can send data as asynchronous messages from one service endpoint to another. A service endpoint can be part of a continuously available service hosted by IIS, or it can be a service hosted in an application.

Table of Contents:

Introduction to WCF Creating a remoting service and a web service Creating a wcf service WCF service implementing multiple service contracts How to make changes to wcf service without breaking clients