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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)

'Declaration
Public Overridable ReadOnly Property ParentKeyConstraint As UniqueConstraint

Property Value

Type: System.Data.UniqueConstraint
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

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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