AcceptChanges and RejectChanges
After verifying the accuracy of changes made to data in a DataTable, you can accept the changes using the AcceptChanges method of the DataRow, DataTable, or DataSet, which will set the Current row values to be the Original values and will set the RowState property to Unchanged. Accepting or rejecting changes clears out any RowError information and sets the HasErrors property to false. Accepting or rejecting changes can also affect updating data in the data source. For more information, see Updating Data Sources with DataAdapters (ADO.NET).
If foreign key constraints exist on the DataTable, changes accepted or rejected using AcceptChanges and RejectChanges are propagated to child rows of the DataRow according to the ForeignKeyConstraint.AcceptRejectRule. For more information, see DataTable Constraints (ADO.NET).
The following example checks for rows with errors, resolves the errors where applicable, and rejects the rows where the error cannot be resolved. Note that, for resolved errors, the RowError value is reset to an empty string, causing the HasErrors property to be set to false. When all the rows with errors have been resolved or rejected, AcceptChanges is called to accept all changes for the entire DataTable.