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DataRelationCollection.Add Method (String, DataColumn[], DataColumn[], Boolean)

Creates a DataRelation with the specified name, arrays of parent and child columns, and value specifying whether to create a constraint, and adds it to the collection.

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

public virtual DataRelation Add (
	string name,
	DataColumn[] parentColumns,
	DataColumn[] childColumns,
	bool createConstraints
public DataRelation Add (
	String name, 
	DataColumn[] parentColumns, 
	DataColumn[] childColumns, 
	boolean createConstraints
public function Add (
	name : String, 
	parentColumns : DataColumn[], 
	childColumns : DataColumn[], 
	createConstraints : boolean
) : DataRelation
Not applicable.



The name of the DataRelation to create.


An array of parent DataColumn objects.


An array of child DataColumn objects.


true to create a constraint; otherwise false.

Return Value

The created relation.

Exception typeCondition


The relation name 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 Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0