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Editorial Team
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Asked: 2026-06-01T13:15:58+00:00

I have recently started studying about threads. I thought of starting from the beginning

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I have recently started studying about threads. I thought of starting from the beginning and started reading MSDN documentation. Read about ApplicationDomain which is separate for each application. But in this link ApplicationDomain and Threads it is mentioned that

Several threads can be executing in a single application domain at any given time and a particular thread is not confined to a single application domain. That is, threads are free to cross application domain boundaries

If a user created a thread and if it is allowed to cross application domain, then can it refer to the objects or memory reference of another applicationdomain ??? Please guide me if I am wrong.

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  1. Editorial Team

    There is no one-one relationship between application domains and threads.
    Although a thread may cross an application domain boundary, at any one time, the thread is executing in a single application domain.

    See the below information from MSDN (http://msdn.microsoft.com/en-us/library/2bh4z9hs%28v=vs.90%29.aspx):

    Code running in one application cannot directly access code or resources from another application. The common language runtime enforces this isolation by preventing direct calls between objects in different application domains. Objects that pass between domains are either copied or accessed by proxy. If the object is copied, the call to the object is local. That is, both the caller and the object being referenced are in the same application domain. If the object is accessed through a proxy, the call to the object is remote. In this case, the caller and the object being referenced are in different application domains. Cross-domain calls use the same remote call infrastructure as calls between two processes or between two machines.

    Also the following article may be useful:
    http://www.codeproject.com/Articles/26148/Beginners-Guide-to-Threading-in-NET-Part-1-of-n

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