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Asked: 2026-05-11T10:23:27+00:00

I seem to be having trouble with preprocessor directives in C#. I’ve created a

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I seem to be having trouble with preprocessor directives in C#. I’ve created a Visual Studio 2008 C# win forms app. I add this:

#if (DEBUG)             textBox1.Text = 'in debug mode'; #else             textBox1.Text = 'in release mode'; #endif

And when I run in debug I see the expected ‘in debug mode’. However when I switch to Release, compile, and run the .exe, I still see the ‘in debug mode’ text. In my project properties I have Define DEBUG constant checked. I even get the correct color-coded syntax for the code above. What gives?

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1 Answer

  1. Any chance you have DEBUG defined for both Debug and Release configurations?

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