Final answer:
The statement regarding the DataAdapter method is true; it is used in ADO.NET to both fetch data from a data source to a DataSet and to update the data source with changes made in the DataSet using its Fill and Update methods.
Step-by-step explanation:
The statement that the DataAdapter method is used to fetch values from the data source to the DataSet and also to update the data source with the DataSet data is true. In the world of .NET programming, specifically with ADO.NET, the DataAdapter serves as a bridge between a DataSet and a data source for retrieving and saving data. The DataAdapter provides this functionality through a series of SQL statements and stored procedures.
When the DataAdapter's Fill method is called, it retrieves data from the data source and populates the DataSet with tables, rows, and columns that correspond to the result set of the query. Conversely, when the DataAdapter's Update method is called, it reflects changes made in the DataSet back to the data source. This includes new rows added, deleted rows, and modified rows.