how to send Treeview Selected value to textbox

[bjmolo]

I have a database with two tables namely Tblreqs and Tbllib, I used Table A to populate into treeview, i want to use the selected node to fill textboxes with data from Table B.
Here are the codes have tried so far, please just new

Imports System.Data.OleDb
Public Class Form1

    Private Sub TblreqsBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs)
        Me.Validate()
        Me.TblreqsBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.CopycopyDataSet)

    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'CopycopyDataSet.tbllib' table. You can move, or remove it, as needed.
        Me.TbllibTableAdapter.Fill(Me.CopycopyDataSet.tbllib)
        'TODO: This line of code loads data into the 'CopycopyDataSet.tbllib' table. You can move, or remove it, as needed.
        Me.TbllibTableAdapter.Fill(Me.CopycopyDataSet.tbllib)
        'TODO: This line of code loads data into the 'CopycopyDataSet.tbllib' table. You can move, or remove it, as needed.
        Me.TbllibTableAdapter.Fill(Me.CopycopyDataSet.tbllib)
        'TODO: This line of code loads data into the 'CopycopyDataSet.tblreqs' table. You can move, or remove it, as needed.
        Me.TblreqsTableAdapter.Fill(Me.CopycopyDataSet.tblreqs)

        GroupTextBox.Text = " "
        DetailsTextBox.Text = " "
        RefnoTextBox.Text = " "
        QtyTextBox.Text = " "
        RateTextBox.Text = " "
        UnitTextBox.Text = " "
        TotalTextBox.Text = " "

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TblreqsTableAdapter.Connection.Open()
        TreeView1.Nodes.Clear()
        FillTree("1", "Library", Nothing)
        TblreqsTableAdapter.Connection.Close()
    End Sub

    Public Sub FillTree(ByVal Key As String, ByVal Txt As String, ByVal N As TreeNode)
        Dim cn As OleDbConnection
        Dim cmd As OleDbCommand
        Dim NN As TreeNode
        If N Is Nothing Then
            NN = TreeView1.Nodes.Add(Key, Txt)
        Else
            NN = N.Nodes.Add(Key, Txt)
        End If
        cn = TblreqsTableAdapter.Connection
        cmd = New OleDbCommand("select * from tblreqs where idparent='" & Key & "'", cn)
        Dim dr = cmd.ExecuteReader
        Do While dr.Read()
            FillTree(dr("id"), dr("detail"), NN)
        Loop
        dr.Close()
        cmd.Dispose()
    End Sub

    Private Sub TreeView1_AfterSelect(sender As Object, e As TreeViewEventArgs) Handles TreeView1.AfterSelect
        Dim cn As OleDbConnection
        Dim wybrany As String
        wybrany = e.Node.Text
        cn = TbllibTableAdapter.Connection
        Dim cmd As New OleDbCommand
        Dim dat As OleDbDataReader
        Dim querry As String = "select Refno, Group, Details, Qty, Rate, Total, Unit from tbllib where (refno) = '" + wybrany + "'"
        cmd = New OleDbCommand(querry, cn)
        dat = cmd.ExecuteReader
        While dat.Read()

            RefnoTextBox.Text = dat.Item(0).ToString
            GroupTextBox.Text = dat.Item(1).ToString
            DetailsTextBox.Text = dat.Item(2).ToString
            QtyTextBox.Text = dat.Item(3).ToString
            RateTextBox.Text = dat.Item(4).ToString
            TotalTextBox.Text = dat.Item(5).ToString
            UnitTextBox.Text = dat.Item(6).ToString


        End While

    End Sub

End Class