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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 System.Data.dll)

abstract Add : 
        name:string * 
        parentColumns:DataColumn[] * 
        childColumns:DataColumn[] * 
        createConstraints:bool -> DataRelation  
override Add : 
        name:string * 
        parentColumns:DataColumn[] * 
        childColumns:DataColumn[] * 
        createConstraints:bool -> DataRelation


Type: System.String

The name of the DataRelation to create.

Type: System.Data.DataColumn[]

An array of parent DataColumn objects.

Type: System.Data.DataColumn[]

An array of child DataColumn objects.

Type: System.Boolean

true to create a constraint; otherwise false.

Return Value

Type: System.Data.DataRelation
The created relation.


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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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