DataRelation Constructor (String, DataColumn[], DataColumn[], Boolean)


Initializes a new instance of the DataRelation class using the specified name, matched arrays of parent and child DataColumn objects, and value that indicates whether to create constraints.

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

new : 
        relationName:string *
        parentColumns:DataColumn[] *
        childColumns:DataColumn[] *
        createConstraints:bool -> DataRelation


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.

Type: System.Boolean

A value that indicates whether to create constraints. true, if constraints are created. Otherwise, false.

Exception Condition

One or both of the DataColumn objects is null.


The columns have different data types


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( _

    Dim bConstraints As Boolean = True
    ' 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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