System.Uri.GetException C# (CSharp) Method

        private static UriFormatException GetException(ParsingError err)
        {
            switch (err)
            {
                case ParsingError.None:
                    return null;
                // Could be OK for Relative Uri
                case ParsingError.BadFormat:
                    return new UriFormatException(SR.net_uri_BadFormat);
                case ParsingError.BadScheme:
                    return new UriFormatException(SR.net_uri_BadScheme);
                case ParsingError.BadAuthority:
                    return new UriFormatException(SR.net_uri_BadAuthority);
                case ParsingError.EmptyUriString:
                    return new UriFormatException(SR.net_uri_EmptyUri);
                // Fatal
                case ParsingError.SchemeLimit:
                    return new UriFormatException(SR.net_uri_SchemeLimit);
                case ParsingError.SizeLimit:
                    return new UriFormatException(SR.net_uri_SizeLimit);
                case ParsingError.MustRootedPath:
                    return new UriFormatException(SR.net_uri_MustRootedPath);
                // Derived class controllable
                case ParsingError.BadHostName:
                    return new UriFormatException(SR.net_uri_BadHostName);
                case ParsingError.NonEmptyHost: //unix-only
                    return new UriFormatException(SR.net_uri_BadFormat);
                case ParsingError.BadPort:
                    return new UriFormatException(SR.net_uri_BadPort);
                case ParsingError.BadAuthorityTerminator:
                    return new UriFormatException(SR.net_uri_BadAuthorityTerminator);
                case ParsingError.CannotCreateRelative:
                    return new UriFormatException(SR.net_uri_CannotCreateRelative);
                default:
                    break;
            }
            return new UriFormatException(SR.net_uri_BadFormat);
        }