The best replacement for datacontract is serializable.

The best alternatives to datacontract are rated as following:
★★★★★  serializable
★★★★  messagecontract
★★★★  operationcontract
★★★★  xmlserializer
★★  collectiondatacontract
★★  datacontractattribute
★  serializable attribute
★  dto
★  datacontractformat
★  netdatacontract

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Speaking about datacontract, one probably shouldn't forget about datamember.

Other search terms related to datacontract and their ratings are:
★★★★★ datamember
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datacontract
serializable
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