Answer / guest

Apartment model threading

Answer / sandeep

apartment threading and single threading. by vb works on
apartment threading, completely not support to single
threading.

Answer / manish

If you've so much as cracked a book on COM, you've undoubtedly come across the term apartment, which describes the constructs in which COM objects are created. If you're unfamiliar with this concept, the often-used analogy of an apartment building may help to clarify.
If you think of the building as an application's process, each apartment is a distinct area in which a COM object can be created. As with the more tangible kind of apartment, a COM apartment is a fairly self-contained unit that shares some similarities with other apartments in the same building/process. But just as there may be lofts, studios, and 2- or 3-bedroom apartments in the same building, there can also be different types of COM apartments within a process. Apartments may also be vacant or have any number of people/objects living in them.
It may be helpful to remember a few key points about COM apartments:
An apartment is not a thread. The one-to-one relationship between threads and single-threaded apartments may lead you to believe that the two terms are interchangeable—they are not.
An object is not an apartment. Objects are created in apartments.
A particular instance of an object can belong to only one apartment.
An apartment's concurrency model, whether it is single-threaded or multi-threaded, cannot be changed after it is created.
A process can have zero or more single-threaded apartments—one for each thread that calls CoInitialize.
A process has one multi-threaded apartment or none at all—all threads that call CoInitializeEx with COINIT_MULTITHREADED share the same apartment.

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