#error (C# Reference)

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

#error Deprecated code in this method.  

Remarks

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

It is also possible to generate a user-defined warning with #warning.

Example

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

See Also

C# Reference
C# Programming Guide
C# Preprocessor Directives