Issue while creating 64 bit project in VS2012

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2.00/5 (1 vote)

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.NET4.5

VS2012

Hi,

My requirement is to create a 64 bit application in Visual Studio 2012. I changed the target platform in project properties to x64.

As I can see the solution works fine when I set target platform to Any CPU or x86, but on selecting x64 it gives me the following error on runtime.

The error is:
Could not load file or assembly 'Demo64bitCheck' or one of its dependencies. An attempt was made to load a program with an incorrect format

Can anyone please help me with this issue.

Thanks

Posted 23-Sep-13 5:29am

sagar wasule

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Sergey Alexandrovich Kryukov 23-Sep-13 11:46am

Not clear: 1) what exactly is the architecture of the system you used? 2) what is the target architecture of each and every assembly and module used by your application?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-09-23T05:43:00

There is no reason to set the Platform to a particular instruction-set architecture it "Any CPU" works. .NET is based in JIT compilation, so the application will be executed on the platform determined during runtime. Please see:
http://en.wikipedia.org/wiki/Instruction_set[^],
http://en.wikipedia.org/wiki/Just-in-time_compilation[^].

You need to use other platforms only when you have at least one assembly or an unmanaged modules compiled to some particular architecture. But in this case, all target platforms should be consistent. For example, you could have all assemblies compiled to "Any CPU", and your entry-level assembly compiled to some particular architecture, because, for example. some unmanaged module is compiled to that. And any other assembly used in application should be compiled as "Any CPU" or to the same architecture. If you have any mismatch in the platforms, it won't work.

Also, you should understand that x86 will work on any of the 64-bit platforms, via WoW64: http://en.wikipedia.org/wiki/WoW64[^].

At the same time, the 64-bit platforms are incompatible with each other. There is no just "64-bit" platform, they are different and cannot be mixed up. Please see:
http://en.wikipedia.org/wiki/Itanium[^],
http://en.wikipedia.org/wiki/X86-64[^],
http://en.wikipedia.org/wiki/X86[^].

If "Any CPU" works, use just it and consider your requirement met. :-)

—SA