DataRelation Constructor (String, DataColumn(), DataColumn())


Initializes a new instance of the DataRelation class using the specified DataRelation name and matched arrays of parent and child DataColumn objects.

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

Public Sub New (
	relationName As String,
	parentColumns As DataColumn(),
	childColumns As DataColumn()


Type: System.String

The name of the relation. If null or an empty string (""), a default name will be given when the created object is added to the DataRelationCollection.

Type: System.Data.DataColumn()

An array of parent DataColumn objects.

Type: System.Data.DataColumn()

An array of child DataColumn objects.

Exception Condition

One or both of the DataColumn objects contains null.


The DataColumn objects have different data types


One or both of the arrays are not composed of distinct columns from the same table.


The tables do not belong to the same DataSet.

The following example creates a new DataRelation and adds it to the DataRelationCollection of a DataSet.

Private Sub CreateRelation()
    ' Code to get the DataSet not shown here.
    ' Get the DataColumn objects from two DataTable 
    ' objects in a DataSet.
    Dim parentColumns() As DataColumn
    Dim childColumns() As DataColumn
    parentColumns(0) = DataSet1.Tables( _
    parentColumns(1) = DataSet1.Tables( _

    childColumns(0) = DataSet1.Tables( _
    childColumns(1) = DataSet1.Tables( _

    ' Create DataRelation.
    Dim CustOrderRel As DataRelation = New DataRelation( _
        "CustomersOrders", parentColumns, childColumns)

    ' Add the relation to the DataSet.
End Sub

.NET Framework
Available since 1.1
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