Updating access table
After you complete an update, you can re-enable constraint checking, which also re-enables update events and raises them.
For more information about suspending events, see Turn off constraints while filling a dataset.
(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.
If the dataset contains constraints (such as foreign keys or non-nullable constraints), it's possible that the record can temporarily be in an error state as you update it.
Additionally, extra columns in the source dataset are added to the target dataset.
Merging datasets is useful when you have a local dataset and you get a second dataset from another application.
Those methods perform the change tracking that's needed for updating the data source.
The following table shows how a record in two datasets is merged: dataset.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 merging datasets, you can pass a Boolean argument () that tells the Merge method whether to retain existing modifications in the target dataset.If you aren't using data binding, and are saving changes for related tables, you have to manually instantiate a variable of the auto-generated Table Adapter Manager class, and then call its Udpate All method.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.
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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.