I promote bit a lot because I personally think my bit machine is snappier and more stable. I also have buttloads of RAM which is nice. The first question developer ask me when I'm pushing bit is "Can I still run Visual Studio the same? Can I make apps that run everywhere? When I'm developing I usually don't sweat any of this. Visual Studio installs and runs just fine. If you care about details, when you install. Some of the things that are bit specific are:. Those are all bit processes.

64-bit operating systems

However, my ConsoleApplication1. It's a bit process and it can access a ridiculous amount of memory if you've got it That bit process is also having its code JIT compiled to use not the x86 instruction set we're used to, but the AMD64 instruction set. The short story is - Intel lost. For us, it doesn't really matter. It's the JIT that makes the decision at the last minute.

Everyone once in a while you'll need to call from managed code into unmanaged and you'll need to give some thought to bit vs. Here's a great bit from an older MSDN article that explains part of it with emphasis mine :.

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In bit Microsoft Windows, this assumption of parity in data type sizes is invalid. Making all data types 64 bits in length would waste space, because most applications do not need the increased size. However, applications do need pointers to bit data, and they need the ability to have bit data types in selected cases. In the LLP64 data model, only pointers expand to 64 bits; all other basic data types integer and long remain 32 bits in length. NET there is an integral data type, not widely known, that is specifically designated to hold 'pointer' information: IntPtr whose size is dependent on the platform e.

Consider the following code snippet:. Short version: If you're using IntPtrs, you care. If you're aware of what IntPtrs are, you likely know this already. If you checked the property System. Size while running as x86, it'll be 4. It'll be 8 while under x To be clear, if you are running x86 even on an x64 machine, System.

Size will be 4. Here's a concrete example. It's a pretty specific edgy thing, but a decent example. Here's an app that runs fine on x See the mistake? It's not totally obvious. Here's what's printed under x86 by changing the project properties :.

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In our case, it doesn't crash, but it sure is wrong. Here's what happens under x64 or AnyCPU and running it on my x64 machine :. See that lat number? Total crap. Remember that IntPtr is smart enough to get bigger and point to the right stuff.

When I change it from int to IntPtr:. You'll also want to think about the assemblies that your application loads. It's possible that when purchasing a vendor's product in binary form or bringing an Open Source project into your project in binary form, that you might consume an x86 compiled. NET assembly. But more than likely the managed application will be involved with any or all of the following:. Regardless of which of these things your application is doing it is going to be important to do your homework and investigate what your code is doing and what dependencies you have.

Once you do this homework you will have to look at your choices to do any or all of the following:. There may be cases where you make the decision either not to migrate the managed code to bit, in which case you have the option to mark your assemblies so that the Windows loader can do the right thing at start up. Keep in mind that downstream dependencies have a direct impact on the overall application. I have found that for smaller apps that don't need the benefits of x64 but need to call into some unmanaged COM components that marking the assemblies as x86 is a reasonable mitigation strategy.

NET app. Very likely you'll not have to deal with this stuff if you're staying managed, but I wanted to put it out there in case you bump into it. Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author. Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.

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Back to Basics: bit and bit confusion around x86 and x64 and the. NET Prog Blog Home Moonlight 1. About Scott Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. Sponsored By.

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Hosting By. What about Itanium?

Then click OK. Jump down to the Visual Studio Solution Explorer section below to continue. Creating a project in Visual Studio or older. A dialog box will pop up that looks something like this:. Instead, choose Win32 and then Win32 Console Application in the main window. Down below, in the Name field, enter the name of your program replace the existing name with HelloWorld. In the Location field, you can optionally select a different location for your project to be placed into. The default is fine for now.

Exception thrown on 64 bit debugging - Developer Community

Click OK. Press Next. At this point, you should see a wizard dialog that looks something like this older versions of Visual Studio use a different style, but have most of the same options :. On the left or right side of the window, you should see a window titled Solution Explorer.