> dear friends
> we deployed one application which is used by company staffs also installed
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> Please let me know is it possible to decompile .NET, exe and dll files and
> access source codes?
Reflector for exemple
http://www.aisto.com/roeder/dotnet/
> if so what should we do to protect it?
well they don't have the documentation, it's already hard enough.
but people concerned about that usually obfuscate their code.
In visual studio 2005 you have an option to do that.
I don't know about the 2003 version but probably it's there...