For example, you might inadvertently write data of the wrong type to a column, or data that's too long, or data that has some other integrity problem.

Or you might have application-specific validation checks that can raise custom errors during any stage of an update event.

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You can prevent a concurrency violation by filling another dataset with the updated records from the data source and then performing a merge to prevent a concurrency violation.

(A concurrency violation occurs when another user modifies a record in the data source after the dataset has been filled.) To make changes to an existing data row, add or update data in the individual columns.

For more information about suspending events, see Turn off constraints while filling a dataset.

When you update a record in a dataset, there is the possibility of an error.

To prevent premature constraint violations you can temporarily suspend update constraints.

This serves two purposes: Note In Windows Forms, the data binding architecture that's built into the datagrid suspends constraint checking until focus moves out of a row, and you do not have to explicitly call the Begin Edit, End Edit, or Cancel Edit methods.Constraints are automatically disabled when the Merge method is invoked on a dataset.When the merge is complete, if there are any constraints on the dataset that cannot be enabled, a Constraint Exception is thrown.Two-stage update process and the role of the Data Row Version in a successful update A dataset contains collections of tables, which contain a collections of rows.If you intend to update an underlying data source later, you must use the methods on the Data Table.When you merge datasets, new records in the source dataset are added to the target dataset.