Тип "<var>Type Name</var>" в пространстве имен "<var>namespace</var>" не может использоваться как базовый тип некоторого типа контракта данных, так как он сам не имеет контракта данных. Пометьте тип "<var>Type Name</var>" с помощью атрибута DataContractAttribute.

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Type '<var>Type Name</var>' in namespace '<var>namespace</var>' cannot be used as the base type of a data contract type, because it itself does not have a data contract. Consider marking type '<var>Type Name</var>' with the DataContractAttribute attribute.

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