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I created one software which written in c#.net and when i created setup file .exe file will be the output but in this .exe file is ex tractable by some software and easy to access the codes.How to prevent this?

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No matter what you do, no matter what you use, somebody will be able to extract/infer the source code of your application from the binary. There's just no way around it. In the worst case they can run the application through a debugger and with assembly knowledge it could be possible to infer the source code.

Having that said, there are many good obfuscatory for .Net. They make it a bit more difficult to extract the source code from the binary. Here's a list of some of them on Wikipedia.

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  • Funny I don't see SLP on that list... inishtech.com
    – makerofthings7
    Commented Jun 29, 2013 at 18:46
  • @makerofthings7 No disrespect, but this is Wikipedia. If there's something missing or you see something you can improve, then add it yourself instead of complaining about it.
    – Adi
    Commented Jun 29, 2013 at 20:25
  • None taken. Also I'm not complaining... The omission makes me question market awareness whenever I would be required to make a product listing, especially when it's a former MSFT product. Maybe there is something unpopular/undesirable with the product I don't know of. That is where I was phishing for information ;)
    – makerofthings7
    Commented Jun 29, 2013 at 20:48
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You could run your project through an obsfucator tool like Eazfuscator.NET.

This should make it a lot more difficult to recover the original source code given the .NET binary file. Of course, this is not 100% foolproof. With enough time and effort, an attacker would probably have a high chance of deobsfucating the binary file.

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  • its minimum requirement is .NET 4.0 but i am using .NET 3.5
    – Suresh E
    Commented Jun 29, 2013 at 11:51
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    @SureshE Search around for other obsfucator tools. There are plenty available out there.
    – user10211
    Commented Jun 29, 2013 at 11:52

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