Тип "<var>Type Name</var>" не может быть производным от типа, который не отмечен с помощью атрибута DataContractAttribute или SerializableAttribute. Отметьте базовый тип "X" с помощью атрибута DataContractAttribute или SerializableAttribute либо удалите их из производного типа.

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Type '<var>Type Name</var>' cannot inherit from a type that is not marked with DataContractAttribute or SerializableAttribute. Consider marking the base type 'X' with DataContractAttribute or SerializableAttribute, or removing them from the derived type.

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