Updating ms access database c
Or you might have application-specific validation checks that can raise custom errors during any stage of an update event.
For more information, see Validate data in datasets.
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.
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.
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.When the merge is complete, if there are any constraints on the dataset that cannot be enabled, a Constraint Exception is thrown.