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Invalid preprocessor expression
The compiler encountered an invalid preprocessor expression.
For more information, see Preprocessor Directives.
The following sample shows some valid and invalid preprocessor expressions:
// CS1517.cs
#if symbol // OK
#endif
#if !symbol // OK
#endif
#if (symbol) // OK
#endif
#if true // OK
#endif
#if false // OK
#endif
#if 1 // CS1517
#endif
#if ~symbol // CS1517
#endif
#if * // CS1517
#endif
class x
{
public static void Main()
{
}
}