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Home/ Questions/Q 8037259
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Editorial Team
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Editorial Team
Asked: June 5, 20262026-06-05T02:52:36+00:00 2026-06-05T02:52:36+00:00

For example: define.cs #define FOO form1.cs #if FOO MessageBox.Show(foo is set!); #else MessageBox.Show(foo is

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For example:

define.cs

#define FOO

form1.cs

#if FOO 
  MessageBox.Show("foo is set!");
#else 
  MessageBox.Show("foo is not set!");
#endif

the define.cs are included on same projet that form1.cs but the above condition give: foo is not!

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  1. Editorial Team
    Editorial Team
    2026-06-05T02:52:37+00:00Added an answer on June 5, 2026 at 2:52 am

    You can’t, but what you can do is move the define to the project configuration so that all files in the project can see the definition.

    See the instructions in How to define a constant globally in C# (like DEBUG).

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