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In this situation, the Enforce Constraints property is set to .

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When merging datasets, you can pass a Boolean argument () that tells the Merge method whether to retain existing modifications in the target dataset.

Because datasets maintain multiple versions of records, it's important to keep in mind that more than one version of the records is being merged.

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.

When you data bind dataset tables to controls on a Windows Form or XAML page, the data binding architecture does all the work for you.

If you're familiar with Table Adapters, you can jump directly to one of these topics: Updating a data source is a two-step process.

The following table details the possible values of the Data Row State enumeration: The row has been created but is not part of any Data Row Collection.

A Data Row object is in this state immediately after it has been created, before it has been added to a collection, and after it has been removed from a collection. The Data Row Version fields are used when retrieving the value found in a Data Row using the Item[String, Data Row Version] property or the Get Child Rows method of the Data Row object.

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.

When you merge datasets, new records in the source dataset are added to the target dataset.

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