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DataRelation.ParentKeyConstraint Property

Gets the UniqueConstraint that guarantees that values in the parent column of a DataRelation are unique.

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

public virtual UniqueConstraint ParentKeyConstraint { get; 
/** @property */
public UniqueConstraint get_ParentKeyConstraint ()

public function get ParentKeyConstraint () : UniqueConstraint

Property Value

A UniqueConstraint that makes sure that values in a parent column are unique.

The following example gets the ParentKeyConstraint of a DataRelation object.

Private Sub GetParentKeyConstraint()
    ' Get a DataRelation from a DataSet.
    Dim relation As DataRelation = _
        DataSet1.Relations("CustomerOrders")

    ' Get the relations parent key constraint.
    Dim constraint As UniqueConstraint = _
        relation.ParentKeyConstraint

    ' Get the constraint's DataColumns
    Dim constraintColumns() As DataColumn
    constraintColumns = constraint.Columns

    ' Print the column names.
    Dim i As Integer
    For i = 0 to constraintColumns.GetUpperBound(0)
       Console.WriteLine(constraintColumns(i).ColumnName.ToString())
    Next i
End Sub

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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