Updating access database from dataset in vb net

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The following table details the possible values of the Data Row Version enumeration: The current version of a record contains all modifications that have been performed on the record since the last time Accept Changes was called.

If the row has been deleted, there is no current version.

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.

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.

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.

After you complete an update, you can re-enable constraint checking, which also re-enables update events and raises them.If you do send the changes back to the database, a second step is required.If you aren't using data-bound controls, you have to manually call the method of the same Table Adapter (or data adapter) that you used to populate the dataset.For more information, see Validate data in datasets.Information about the changes in a dataset is maintained in two ways: by flagging rows that indicate that they have changed (Row State), and by keeping multiple copies of a record (Data Row Version).

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