Is there a way in C# to replicate a '#ifndef _DEBUG' from C/C++?

#if DEBUG
    Console.WriteLine("Debug version");
#endif

#if !DEBUG
    Console.WriteLine("NOT Debug version");
#endif

See this.

#if !DEBUG
     // whatever
#endif

Yes you can use preprocessors in C#.

Here is a list from msdn

http://msdn.microsoft.com/en-us/library/ed8yd1ha(VS.71).aspx

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