static void Main(string[] args) { var e1 = Object.ReferenceEquals("Accept", HeaderNames.Accept); var e2 = Object.ReferenceEquals("Accept", HeaderNames.AcceptConst); var e3 = Object.ReferenceEquals(HeaderNames.Accept, HeaderNames.AcceptConst); Console.WriteLine(e1); Console.WriteLine(e2); Console.WriteLine(e3); Console.WriteLine(HeaderNames.IsAccept("accept")); Console.WriteLine(HeaderNames.IsAcceptConst("accept")); Console.WriteLine(HeaderNames.X); }