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Asked: 2026-05-24T02:34:14+00:00

I’ve been preparing for MS 70-513 exam and with the Self-paced training kit content

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I’ve been preparing for MS 70-513 exam and with the Self-paced training kit content cd there are some practice tests.

The following is one question of those tests which I kindly ask someone to explain. The correctly marked answer is A, however I don’t understand why D isn’t the correct one.

Question:

What is the default behavior for instancing service objects in WCF?

A – Each instance is associated with one user-defined service object.

B – Each instance handles all requests for the lifetime of the requesting application.

C – A new instance is created for each client request.

D – A new instance is created for each new client session.

Thakns in advance,
Bruno

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1 Answer

  1. Editorial Team

    I got an answer from msdn forums, I guess I’m convinced with it.

    http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/2e35729f-603a-4a52-a3b7-920c9f3a8100/

    Quoting the answer:

    This is a tricky one – I assume that the reason D is not true is that
    not every client creates a session. For example basicHttpBinding does
    not support sessions. So if you don’t always have a session – D is not
    always true. However, A is always true (unless you create your own
    custom behavior) because every InstanceContext object wraps a single
    user-defined service object (an object created according to your
    service type)

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