#define isn't used in C# (well it is sort of, see below, but the general usage isn't available)

You can't use it to create macros. Bloody annoying, but get over it – you can't!  So instead use constants.

See constants here

#if DEBUG

See here.

How #define is used in C#

#define is only used to create something to test against (e.g. #if DEBUG #endif)

#define can only appear at the start of a file.

#define only has scope in the file it is defined in.

Global defines in C#

You can define for an entire project in Project Properties > Build > Conditional compilation symbols

 

Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.

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