Home / bidating / C datagridview not updating database

C datagridview not updating database

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).

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.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 .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.For the latest documentation on Visual Studio 2017, see Save data back to the database on docs. If you modify that data, it's a good practice to save those changes back to the database.You do this in one of three ways: 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.Those methods perform the change tracking that's needed for updating the data source.If you call the Remove At collection on the Rows property, the deletion won't be communicated back to the database. When you merge datasets, new records in the source dataset are added to 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 shows how a record in two datasets is merged: dataset.

180 comments

Leave a Reply

Your email address will not be published. Required fields are marked *

*