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Merging datasets is useful when you have a local dataset and you get a second dataset from another application.It's also useful when you get a second dataset from a component such as an XML web service, or when you need to integrate data from multiple datasets.When you merge datasets, new records in the source dataset are added to the target dataset.Additionally, extra columns in the source dataset are added to the target dataset.

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.The following table shows how a record in two datasets is merged: dataset.This means that if you try to update the original data source with the target dataset, it might not be able to find the original row to update.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.

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