Updating datagridview in c mark harmon pauley perrette dating

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.This serves two purposes: In Windows Forms, the data binding architecture that's built into the datagrid suspends constraint checking until focus moves out of a row, and you do not have to explicitly call the Begin Edit, End Edit, or Cancel Edit methods.Constraints are automatically disabled when the Merge method is invoked on a dataset.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.

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

Because datasets maintain multiple versions of records, it's important to keep in mind that more than one version of the records is being merged.

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

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.

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