Please explain briefly different Instance Modes in WCF?

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WCF will bind an incoming message request to a particular service instance, so the available modes are:
  • Per Call: instance created for each call, most efficient in term of memory but need to maintain session.
  • Per Session: Instance created for a complete session of a user. Session is maintained.
  • Single: Only one instance created for all clients/users and shared among all.Least efficient in terms of memory.

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