C dataadapter update not updating database

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.

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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.

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.

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.

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.

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.

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