Gurux.DLMS.GXDLMSException.GetDiagnostic C# (CSharp) Method

        static string GetDiagnostic(SourceDiagnostic diagnostic)
        {
            if (diagnostic == SourceDiagnostic.NoReasonGiven)
            {
                return "No reason is given.";
            }
            if (diagnostic == SourceDiagnostic.ApplicationContextNameNotSupported)
            {
                return "The application context name is not supported.";
            }
            if (diagnostic == SourceDiagnostic.AuthenticationMechanismNameNotRecognised)
            {
                return "The authentication mechanism name is not recognized.";
            }
            if (diagnostic == SourceDiagnostic.AuthenticationMechanismNameReguired)
            {
                return "Authentication mechanism name is required.";
            }
            if (diagnostic == SourceDiagnostic.AuthenticationFailure)
            {
                return "Authentication failure.";
            }
            if (diagnostic == SourceDiagnostic.AuthenticationRequired)
            {
                return "Authentication is required.";
            }
            throw new InvalidOperationException();
        }