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

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

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

public virtual DataRelation Add(
	string name,
	DataColumn[] parentColumns,
	DataColumn[] childColumns


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.

Return Value

Type: System.Data.DataRelation
The created DataRelation.


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.

If the relation is successfully added to the collection, the CollectionChanged event occurs.

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

private void AddRelation() 
    DataTable table = new DataTable();
    DataColumn column1 = table.Columns.Add("Column1");
    DataColumn column2 = table.Columns.Add("Column2");
    table.ChildRelations.Add("New Relation", column1, column2);

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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