C datagridview not updating database
If the dataset contains constraints (such as foreign keys or non-nullable constraints), it's possible that the record can temporarily be in an error state as you update it.That is, it can be in an error state after you finish updating one column but before you get to the next one.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.(A concurrency violation occurs when another user modifies a record in the data source after the dataset has been filled.) To make changes to an existing data row, add or update data in the individual columns.When merging datasets, you can pass a Boolean argument () that tells the Merge method whether to retain existing modifications in the target dataset.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 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.
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.When you data bind dataset tables to controls on a Windows Form or XAML page, the data binding architecture does all the work for you.
If you're familiar with Table Adapters, you can jump directly to one of these topics: Updating a data source is a two-step process.To prevent premature constraint violations you can temporarily suspend update constraints.This serves two purposes: Note 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.Merging datasets is useful when you have a local dataset and you get a second dataset from another application.