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Home/ Questions/Q 273633
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T00:29:11+00:00 2026-05-12T00:29:11+00:00

Imagine a pure .NET application which do not uses COM components nor PInvoke. Does

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Imagine a pure .NET application which do not uses COM components nor PInvoke. Does it matters if the target system is 32 or 64 bits?

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  1. Editorial Team
    Editorial Team
    2026-05-12T00:29:11+00:00Added an answer on May 12, 2026 at 12:29 am

    Assuming safe code with no COM components, P/Invoke, etc. there should be no semantic difference, but performance may be impacted. Consider: More memory under 64-bit, but references are bigger. Win some, lose some.

    Anyway, here are a few useful references:

    • See MSDN: Migrating 32-bit Managed Code to 64-bit. Quote:

    "[…] Consider a .NET application
    that is 100% type safe code. In this
    scenario it is possible to take your
    .NET executable that you run on your
    32-bit machine and move it to the
    64-bit system and have it run
    successfully. Why does this work?
    Since the assembly is 100% type safe
    we know that there are no dependencies
    on native code or COM objects and that
    there is no ‘unsafe’ code which means
    that the application runs entirely
    under the control of the CLR. The CLR
    guarantees that while the binary code
    that is generated as the result of
    Just-in-time (JIT) compilation will be
    different between 32-bit and 64-bit,
    the code that executes will both be
    semantically the same. […]"

    • Also see Maoni’s WebLog : 64-bit vs
      32-bit

    • Also see Scott Hanselman’s Computer Zen –
      Back to Basics: 32-bit and 64-bit
      confusion around x86 and x64

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