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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

public virtual DataRelation Add (
	DataColumn[] parentColumns,
	DataColumn[] childColumns
public DataRelation Add (
	DataColumn[] parentColumns, 
	DataColumn[] childColumns
public function Add (
	parentColumns : DataColumn[], 
	childColumns : DataColumn[]
) : DataRelation



The parent columns of the relation.


The child columns of the relation.

Return Value

The created relation.

Exception typeCondition


The relation argument is a null value.


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


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


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.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0