What Is The Use Of ServiceBehavior Attribute In WCF? | WCF Interview Question

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ServiceBehaviour attribute is used to specify the InstanceContextMode for the WCF Service class (This can be used to maintain a state of the service or a client too) 

There are three instance Context Mode in the WCF 

PerSession : This is used to create a new instance for a service and the same instance is used for all method for a particular client. (eg: State can be maintained per session by declaring a variable) 

PerCall : This is used to create a new instance for every call from the client whether same client or different. (eg: No state can be maintained as every time a new instance of the service is created) 

Single : This is used to create only one instance of the service and the same instance is used for all the client request. (eg: Global state can be maintained but this will be applicable for all clients)