Writes the entire DataSet as a DiffGram, including original and current values. To generate a DiffGram containing only changed values, call GetChanges, and then call WriteXml as a DiffGram on the returned DataSet.
Writes the current contents of the DataSet as XML data, without an XSD schema. If no data is loaded into the DataSet, nothing is written.
Writes the current contents of the DataSet as XML data with the relational structure as inline XSD schema. If the DataSet has only a schema with no data, only the inline schema is written. If the DataSet does not have a current schema, nothing is written.