Row cannot be located for updating some values dating place ru

28 Jun

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.

When the merge is complete, if there are any constraints on the dataset that cannot be enabled, a Constraint Exception is thrown.

In this situation, the Enforce Constraints property is set to .

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.

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.

That is, it can be in an error state after you finish updating one column but before you get to the next one.

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When merging datasets, you can pass a Boolean argument () that tells the Merge method whether to retain existing modifications in the target dataset.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.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).By using this information, processes can determine what has changed in the dataset and can send appropriate updates to the data source.