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DataSet.Relations Property

Get the collection of relations that link tables and allow navigation from parent tables to child tables.

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

'Declaration
Public ReadOnly Property Relations As DataRelationCollection

Property Value

Type: System.Data.DataRelationCollection
A DataRelationCollection that contains a collection of DataRelation objects. An empty collection is returned if no DataRelation objects exist.

The following example prints the column name of all child tables through the Relations property.

Private Sub PrintChildRelationRows()
   ' Declare variable to hold the row values. 
   Dim rowValues As String 
   Dim dataSet As DataSet

   ' Get the DataSet of a DataGrid that is displaying data  
   ' of at least two tables. 
   Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)

   ' Navigate using the Relations. 
   Dim relation As DataRelation
   Dim row As DataRow
   Dim column As DataColumn

   ' Print the names of each column in each table. 
   For Each relation In dataSet.Relations
      For Each column in relation.ChildTable.Columns
          rowValues &= column.ColumnName & " " 
      Next 
    Next 

    ' Display results.
    Console.WriteLine(rowValues)
   End Sub

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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