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c# - When #if DEBUG runs

I have this code in my C# class.

#if DEBUG
        private const string BASE_URL = "http://www.a.com/";
#else
        private const string BASE_URL = "http://www.b.com//";
#endif

What I wanted to ask is when does the

#if DEBUG

path in the code get executed?

Does it get executed

  1. When I run up a debug session in Visual Studio?
  2. When I manually run the exe or dll in question from the debug folder?
  3. Any other circumstances I forgot to mention?
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by (71.8m points)

#if DEBUG It's a preprocessor definition.

It compiles when you define DEBUG constant. And yes, it's default on Debug Build Configuration.

Visual Studio 2010 Project Properties: Visual Studio 2010 Project Properties

If Define DEBUG constant is checked VS will compile:

private const string BASE_URL = "http://www.a.com/";

Else (not checked) VS will compile:

private const string BASE_URL = "http://www.b.com//";

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