//methods
        private Variant ReadValue(IBinaryDecoder encoder, BuiltInType encodingByte)
        {
            switch (encodingByte)
            {
            case BuiltInType.Boolean:
                return(new Variant(encoder.ReadBoolean(), encodingByte));

            case BuiltInType.SByte:
                return(new Variant(encoder.ReadSByte(), encodingByte));

            case BuiltInType.Byte:
                return(new Variant(encoder.ReadByte(), encodingByte));

            case BuiltInType.Int16:
                return(new Variant(encoder.ReadInt16(), encodingByte));

            case BuiltInType.UInt16:
                return(new Variant(encoder.ReadUInt16(), encodingByte));

            case BuiltInType.Int32:
            case BuiltInType.Enumeration:
                return(new Variant(encoder.ReadInt32(), encodingByte));

            case BuiltInType.UInt32:
                return(new Variant(encoder.ReadUInt32(), encodingByte));

            case BuiltInType.Int64:
                return(new Variant(encoder.ReadInt64(), encodingByte));

            case BuiltInType.UInt64:
                return(new Variant(encoder.ReadUInt64(), encodingByte));

            case BuiltInType.Float:
                return(new Variant(encoder.ReadSingle(), encodingByte));

            case BuiltInType.Double:
                return(new Variant(encoder.ReadDouble(), encodingByte));

            case BuiltInType.String:
                return(new Variant(ReadString(encoder), encodingByte));

            case BuiltInType.DateTime:
                return(new Variant(ReadDateTime(encoder), encodingByte));

            case BuiltInType.Guid:
                return(new Variant(ReadGuid(encoder), encodingByte));

            case BuiltInType.ByteString:
                return(new Variant(ReadByteString(encoder), encodingByte));

            case BuiltInType.XmlElement:
                return(new Variant(ReadXmlElement(encoder), encodingByte));

            case BuiltInType.NodeId:
                return(new Variant(ReadNodeId(encoder), encodingByte));

            case BuiltInType.ExpandedNodeId:
                return(new Variant(ReadExpandedNodeId(encoder), encodingByte));

            case BuiltInType.StatusCode:
                return(new Variant(ReadStatusCode(encoder), encodingByte));

            case BuiltInType.QualifiedName:
                return(new Variant(ReadQualifiedName(encoder), encodingByte));

            case BuiltInType.LocalizedText:
                return(new Variant(ReadLocalizedText(encoder), encodingByte));

            case BuiltInType.ExtensionObject:
                return(new Variant(ReadExtensionObject(encoder), encodingByte));

            case BuiltInType.DataValue:
                return(new Variant(ReadDataValue(encoder), encodingByte));

            default:
                throw new ArgumentOutOfRangeException($"Cannot decode unknown type in Variant object (0x{encodingByte:X}).");
            }
        }