DataRelationCollection.Add Method (DataColumn(), DataColumn())

 

Creates a DataRelation with the specified parent and child columns, and adds it to the collection.

Namespace:   System.Data
Assembly:  System.Data (in System.Data.dll)

Public Overridable Function Add (
	parentColumns As DataColumn(),
	childColumns As DataColumn()
) As DataRelation

Parameters

parentColumns
Type: System.Data.DataColumn()

The parent columns of the relation.

childColumns
Type: System.Data.DataColumn()

The child columns of the relation.

Return Value

Type: System.Data.DataRelation

The created relation.

Exception Condition
ArgumentNullException

The relation argument is a null value.

ArgumentException

The relation already belongs to this collection, or it belongs to another collection.

DuplicateNameException

The collection already has a relation with the same name. (The comparison is not case sensitive.)

InvalidConstraintException

The relation has entered an invalid state since it was created.

When a DataRelation object is added to the collection, ForeignKeyConstraint and UniqueConstraint objects are created by default if they do not already exist.

.NET Framework
Available since 1.1
Return to top
Show: