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ForeignKeyConstraint.Columns Property

Gets the child columns of this constraint.

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

public virtual DataColumn[] Columns { get; }

Property Value

Type: System.Data.DataColumn[]
An array of DataColumn objects that are the child columns of the constraint.

The following example returns an array of DataColumn objects through the Columns property.

Private Sub GetColumns()
   Dim dataColumns() As DataColumn
   Dim relation As DataRelation
   Dim i As Integer  
   ' Get the DataRelation from a DataSet. 
   For Each relation In DataSet1.Relations
      If relation.GetType.ToString = _
        "System.Data.ForeignKeyConstraint" Then
        dataColumns = relation.ParentColumns
           For i = 0 To dataColumns.GetUpperBound(0)
           Next i
      End If 
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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