When a DataRow
is modified, ADO.NET marks the row
as having a pending change and sets the RowState
of the DataRow to Added,
Modified, or Deleted as
appropriate. ADO.NET also maintains version information by tracking
both Original and Current
versions of each row. Together, this information allows ADO.NET to
identify both the rows and columns that have been changed.
The DataRow has three
methods—GetChanges( )
,
AcceptChanges( ), and RejectChanges( )—that can commit or discard the changes made to a
DataRow since it was last loaded or since
AcceptChanges( ) was last called. These methods
function identically to the same methods for the
DataSet that are described in Chapter 6. Also, when these methods are called on a
DataSet, they are implicitly called on all tables
contained within the DataSet and from there are
called implicitly on all rows in the table.