Gets the collection of constraints maintained by this table.
Assembly: System.Data (in System.Data.dll)
A ForeignKeyConstraint restricts the action performed when a value in a column (or columns) is either deleted or updated. Such a constraint is intended to be used with primary key columns. In a parent/child relationship between two tables, deleting a value from the parent table can affect the child rows in one of the following ways.
The child rows can also be deleted (a cascading action).
The values in the child column (or columns) can be set to null values.
The values in the child column (or columns) can be set to default values.
An exception can be generated.
A UniqueConstraint becomes active when attempting to set a value in a primary key to a non-unique value.