#error
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#error (C# Reference)

#error lets you generate an error from a specific location in your code. For example:

#error Deprecated code in this method.

A common use of #error is in a conditional directive.

It is also possible to generate a user-defined warning with #warning (C# Reference).

// preprocessor_error.cs
// CS1029 expected
#define DEBUG
class MainClass 
{
    static void Main() 
    {
#if DEBUG
#error DEBUG is defined
#endif
    }
}
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