Adding treenode using background worker

Private Sub ToolStripButton11_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ToolStripButton11.Click

      Dim clbItems As New List(Of String)


      ' Make data ready for the thread
      For Each item As TreeNode In TreeView4.Nodes
          clbItems.Add(item.Text)
      Next

      If BackgroundWorker1.IsBusy Then
          ToolStripButton11.Enabled = False
          ToolStripStatusLabel1.Text = "Canceling..."

          BackgroundWorker1.CancelAsync()
      Else
          ToolStripButton11.Text = "Cancel"
          ToolStripStatusLabel1.Text = "Running..."

          BackgroundWorker1.RunWorkerAsync(clbItems)
      End If
  End Sub

  Private Sub BackgroundWorker1_DoWork_1(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork

      Dim bwAsync As BackgroundWorker = TryCast(sender, BackgroundWorker)

      Dim clbItems As List(Of String) = CType(e.Argument, List(Of String))
      Dim item As String

      ' These 5 line should not have to be run each time through the loop
      Dim con As New SqlConnection(My.Settings.SQLServerConn)
      con.Open()
      Dim cmd As New SqlCommand()
      cmd.Connection = con
      cmd.CommandTimeout = 0
      cmd.CommandType = CommandType.StoredProcedure

      For Each item In clbItems

          ' Send string item to the ProgressChanged event to update GUI safely
          bwAsync.ReportProgress(0, item)


          If bwAsync.CancellationPending Then

              Thread.Sleep(1200)


              e.Cancel = True
              Return
          End If

          cmd.CommandText = item
          'Thread.Sleep(1200)
          cmd.ExecuteNonQuery()

          ' HERE I WOULD LIKE TO ADD NODE TO ITEM (WHICH REPRESENTS SP)

      Next

      ' Don't forget to close the connection
      con.Close()

  End Sub

  Private Sub BackgroundWorker1_RunWorkerCompleted_1(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted


      ToolStripButton11.Text = "Run Stored procedures"
      ToolStripButton11.Enabled = True

      ' Check to see if an error occured in the
      ' background process.
      If e.[Error] IsNot Nothing Then
          MessageBox.Show(e.[Error].Message)
          Return
      End If

      ' Check to see if the background process was cancelled.
      If e.Cancelled Then
          ToolStripStatusLabel1.Text = "Cancelled..."
      Else
          ' Everything completed normally.
          ' process the response using e.Result

          ToolStripStatusLabel1.Text = "Completed..."
      End If
  End Sub

  Private Sub BackgroundWorker1_ProgressChanged_1(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged

      ToolStripStatusLabel1.Text = e.UserState.ToString

  End Sub