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The following table shows how a record in two datasets is merged: dataset.

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Exactly as in the example illustration, all these steps only provide access to "system" databases, and no option to select existing user databases that you want to access.

For the latest documentation on Visual Studio 2017, see Save data back to the database on docs. If you modify that data, it's a good practice to save those changes back to the database.

Data Row Collection property when adding or removing rows.

Those methods perform the change tracking that's needed for updating the data source.

If you call the Remove At collection on the Rows property, the deletion won't be communicated back to the database. 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.

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.

If you do send the changes back to the database, then a second step is required.

If you aren't using data-bound controls, then you have to manually call the Update method of the same Table Adapter (or data adapter) that you used to populate the dataset.

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

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