Adding nodes to a treeview control

Private Sub bindRegions()
        Dim connectionString As String = ConfigurationManager.ConnectionStrings("PCI").ConnectionString
        Dim conn As SqlConnection
        conn = New SqlConnection(connectionString)
        Dim DSRegions As DataSet
        Dim DARegions As New SqlClient.SqlDataAdapter("SELECT RegionID, RegionName FROM Region", conn)
        Dim DACountries As New SqlClient.SqlDataAdapter("SELECT CountryID, CountryName FROM Country", conn)
        Dim DASubRegions As New SqlClient.SqlDataAdapter("Select SubRegionID, SubRegionID from SubRegion", conn)
 
        DSRegions = New DataSet()
        conn.Open()
        DARegions.Fill(DSRegions, "dtRegions")
        DACountries.Fill(DSRegions, "dtCountries")
        DASubRegions.Fill(DSRegions, "dtSubRegions")
        'Close the connection to the data store; free up the resources
        conn.Close()
 
        'Create a data relation object to facilitate the relationship between the Customers and Orders data tables.
        DSRegions.Relations.Add("RegionToCountry", DSRegions.Tables("dtRegions").Columns("RegionID"), DSRegions.Tables("dtCountries").Columns("RegionID"))
        DSRegions.Relations.Add("CountryToSubRegion", DSRegions.Tables("dtCountries").Columns("CountryID"), DSRegions.Tables("dtSubRegions").Columns("CountryID"))
        '''''''''''''''''''''''
        TreeRegions.Nodes.Clear()
        Dim i, n As Integer
        Dim parentrow As DataRow
        Dim ParentTable As DataTable
        ParentTable = DSRegions.Tables("dtRegions")
 
        For Each parentrow In ParentTable.Rows
            Dim parentnode As TreeNode
            parentnode = New TreeNode(parentrow.Item(0))
            TreeRegions.Nodes.Add(parentnode)
            ''''populate child'''''
            '''''''''''''''''''''''
            Dim childrow As DataRow
            Dim childnode As TreeNode
            childnode = New TreeNode()
            For Each childrow In parentrow.GetChildRows("RegionToCountry")
                childnode = parentnode.ChildNodes.Add( = (childrow(0) & " " & childrow(1) & " " & childrow(2))
                childnode.Value = childrow("OrderID")
                ''''populate child2''''
                ''''''''''''''''''''''''''
                Dim childrow2 As DataRow
                Dim childnode2 As TreeNode
                childnode2 = New TreeNode()
                For Each childrow2 In childrow.GetChildRows("OrdToDet")
                    childnode2 = childnode.ChildNodes.Add.Add(childrow2(0))
 
                Next childrow2
                ''''''''''''''''''''''''
 
            Next childrow
            '''''''''''''''
        Next parentrow
 
    End Sub

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