22.1 a) rows, columns. b) primary key. c) DbContext
. d) DataGridView
. e) joining. f) foreign key. g) BindingSource
. h) DataSource
.
22.2 a) False. Multiple rows can have the same value for a foreign key. Providing the same value for the primary key in multiple rows causes the DBMS to report an error, because duplicate primary keys would prevent each row from being identified uniquely. b) True. c) True. d) False. A Binding-Navigator
allows users to browse and manipulate data displayed by another GUI control. A DbContext
can extract data from a database. e) False. You must call the SaveChanges
method of the DbContext
to save the changes made back to the database.