Parent/Child/GrandChild

[bfullen]

My question is for VB.NET 2008

I have three tables:

Customer (Parent)
AssignedApp (Child)
Application (GrandChild)


Assigned App is simply an associative table used to relate the Customer Table to The Applications table. I am able to set up a Parent/Child relationship between Customer and Assigned App, but not to the grandchild table. Here is the code I have used for the initial Parent/Child, but would actually like to not show the child data, but actually the grandchild data.

Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Windows.Forms

Public Class Form3
Inherits System.Windows.Forms.Form

Public Sub New()

' This call is required by the Windows Form Designer.
InitializeComponent()

' Add any initialization after the InitializeComponent() call.
txtCustomer.Dock = DockStyle.Fill
dgvDetail.Dock = DockStyle.Fill

Dim splitContainer1 As New SplitContainer()
splitContainer1.Dock = DockStyle.Fill
splitContainer1.Orientation = Orientation.Horizontal
splitContainer1.Panel1.Controls.Add(txtCustomer)
splitContainer1.Panel1.Controls.Add(dgvDetail)

Me.Controls.Add(splitContainer1)
Me.Text = "DataGridView master/detail demo"

End Sub

Private dvMaster As New DataView
Private bsMaster As New BindingSource()
Private txtCustomer As New TextBox
Private dgvDetail As New DataGridView()
Private bsDetail As New BindingSource()

Private Sub Form3_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
' Bind the DataGridView controls to the BindingSource
' components and load the data from the database.
dgvDetail.DataSource = bsDetail

GetData()
txtCustomerName.DataBindings.Add("Text", dvMaster, "CustName")

' Configure the details DataGridView so that its columns automatically
' adjust their widths when the data changes.
dgvDetail.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells

End Sub

Private Sub GetData()
Try
Try
' Specify a connection string.
Dim connectionString As String = _
"Integrated Security=SSPI;Persist Security Info=False;" & _
"Initial Catalog=AccessControl;Data Source=localhost"
Dim cn As New SqlConnection(connectionString)

' Create a DataSet.
Dim ds As New DataSet()

' Add data from the Customer table to the DataSet.
Dim masterDataAdapter As New SqlDataAdapter("select * from Customer", cn)
masterDataAdapter.Fill(ds, "Customer")

' Add data from the AssignedApp table to the DataSet.
Dim detailsDataAdapter As New SqlDataAdapter("select * from AssignedApp", cn)
detailsDataAdapter.Fill(ds, "AssignedApp")

' Establish a relationship between Customer and AssignedApp.
Dim relation As New DataRelation("CustomerAssignedApp", _
ds.Tables("Customer").Columns("CustomerID"), _
ds.Tables("AssignedApp").Columns("CustomerID"))
ds.Relations.Add(relation)

' Bind the master data connector to the Customer table.
bsMaster.DataSource = ds
bsMaster.DataMember = "Customer"

dvMaster = New DataView(ds.Tables("Customer"))

' Bind the details data connector to the master data connector,
' using the DataRelation name to filter the information in the
' details table based on the current row in the master table.
bsDetail.DataSource = bsMaster
bsDetail.DataMember = "CustomerAssignedApp"

Catch ex As SqlException
MessageBox.Show("To run this example, replace the value of the " & _
"connectionString variable with a connection string that is " & _
"valid for your system.")
End Try

End Sub
End Class