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    <p>Java uses bytecode. C#, while it uses IL as an intermediate step, has <em>always</em> compiled to native code. IL is never directly interpreted for execution as Java bytecode is. You can even pre-compile the IL before distribution, if you really want to (hint: performance is normally better <em>in the long run</em> if you don't).</p> <p>The idea that C# is slow is laughable. Some of the <em>winforms components</em> are slow, but if you know what you're doing C# itself is a very speedy language. In this day and age it generally comes down to the algorithm anyway; language choice won't help you if you implement a bad bubble sort. If C# helps you use more efficient algorithms from a higher level (and in my experience it generally does) that will trump any of the other speed concerns.</p> <hr> <p>Based on your edit, I also want to explain the (typical) compilation path again.</p> <p>C# is compiled to IL. This IL is distributed to local machines. A user runs the program, and that program is then JIT-compiled to native code for that machine <em>once</em>. The next time the user runs the program on that machine they're running a fully-native app. There is also a JIT optimizer that can muddy things a bit, but that's the general picture.</p> <p>The reason you do it this way is to allow individual machines to make compile-time optimizations appropriate to that machine. You end up with faster code on average than if you distributed the same fully-compiled app to everyone.</p> <hr> <p>Regarding decompilation: </p> <p>The first thing to note is that you can pre-compile to native code before distribution if you really want to. At this point you're close to the same level as if you had distributed a native app. However, that won't stop a determined individual. </p> <p>It also largely misunderstands the economics at play. Yes, someone might perhaps reverse-engineer your work. But this assumes that all the value of the app is in the technology. It's very common for a programmer to over-value the code, and undervalue the execution of the <em>product</em>: interface design, marketing, connecting with users, and on-going innovation. If you do all of that right, a little extra competition will help you as much as it hurts by building up demand in your market. If you do it wrong, hiding your algorithm won't save you.</p> <p>If you're more worried about your app showing up on warez sites, you're even more misguided. It'll show up there anyway. A much better strategy is to <a href="https://stackoverflow.com/questions/651291/securing-a-net-application">engage those users</a>.</p> <hr> <p>At the moment, the biggest impediment to adoption (imo) is that the framework redistributable has become mammoth in size. Hopefully they'll address that in a relatively near release.</p>
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    1. POCould managed code (specifically .NET) ever become 'unmanaged'?
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    1. USJoel Coehoorn
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    1. COI always get a little chuckle out of people that have no clue how far apart C# and Java are.
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    2. CORE: the second paragraph - well said sir
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    3. COBut then why can I still throw .NET programs into the .NET Reflector and get the source code out of it? Point being, the fact remains that decompilation remains a risk. Yes C++ is decompilable too, but the level of difficulty is worlds apart, and I think this is why you won't see .NET Photoshop.
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