Invalid value for named attribute argument 'format'
An invalid argument was passed to an attribute.
The following sample generates CS0599:
using System; [sysstruct(format=System.Interop.CharacterSet.Auto)] // CS0599 // try one of the two possible solutions // [sysstruct(format=System.Interop.CharacterSet.Ansi)] // [sysstruct(format=System.Interop.CharacterSet.Unicode)] public class C { } public class A { public static void Main () { } }