Explain what a diffgram is, and a good use for one?
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A DiffGram is an XML format that is used to identify current
and original versions of data elements . The DataSet uses
the DiffGram format to load and persist its contents, and to
serialize its contents for transport across a network
connection. Whena DataSet is written as a DiffGram, it
populates the DiffGram with all the necessary information to
accurately recreate the contents, though not the schema, of
the DataSet, including column values from both the Original
and Current row versions, row error information, and row order.
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