Three ways to do WCF instance management

Very often we would like to control the way WCF service objects are instantiated on a WCF server. You would want to control how long the WCF instances should be residing on the server.
The WCF framework has provided three ways by which we can control WCF instance creation. In this article, we will first try to understand those three ways of WCF service instance control with simple code samples of how to achieve them. Finally, we will compare when to use them and under what situations.
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