fcbb435a_ofessional_Growth__Leadership___Description
[Title] Durable service using SQL persistence provider [Category] Instance Management [Last Updated] 10/30/2008 [Description] 
For durable services that use the DurableService attribute to have WCF serialize and desterilize their state between calls, you need to configure the host with the details of a persistence provider in the config file. You can use the WCF-provided SQL persistence factory of SqlPersistenceProviderFactory. The client still needs to manage the instance ID on its side, and that is done using the dedicated IDesign helper classed for context binding and instance ID. You will also see when to set the CompletesInstance property of the DurableOperation attribute to remove the instance state from the store, and how the client picks up a new instance ID on subsequent calls.
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