Comments/Troubleshooting
Constraint
objects are contained in a
ConstraintCollection. Every
DataTable exposes a
ConstraintCollection through its
Constraints property, which can contain
UniqueKeyConstraint and
ForeignKeyConstraint objects.
Both UniqueKeyConstraint and
ForeignKeyConstraint classes can be created
manually. In addition, a UniqueKeyConstraint may
be created automatically when filling a DataSet
with schema information, and both a
ForeignKeyConstraint and a
UniqueKeyConstraint may be generated when a
DataRelation is defined and added to a table. For
more information, refer to Chapter 10.
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