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Boa tarde, tou aqui com a seguinte situação tenho uma base de dados com tabelas relacionadas, e quero gravar na tabelaA um campo da tabelaB em que as tabelas estao relacionadas por um campo.

a minha questao e a seguinte mostrar os campos numa combobox vindas da tabelaB e gravar na tabelaA esse campo relacionado, eu ate consigo listar na combo so que depois nao csg gravar estou com o seguinte codigo:

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If con.State = ConnectionState.Open Then con.Close()
            Call dados() 'procedimento que me chama a listagem de dados q tenho para o form
            Dim ds As New DataSet
            Dim dt As New DataTable
            Dim adap As New OleDbDataAdapter("select * from tabela2", con)
            adap.Fill(ds, "tabela2")
            dt = ds.Tables(0)
    With Me.ComboBox2
                .DataSource = ds.Tables(0).DefaultView
                .DisplayMember = "nome"
                .ValueMember = "idtabela2"
                'Call Limpa()
            End With
    End Sub

codigo do botao de gravar:

If con.State = ConnectionState.Open Then con.Close()
                    Dim st As String
                    st = "INSERT INTO Tabela(nome,idade,idtabela2)VALUES('" & TextBox2.Text & "','" & TextBox3.Text & "','" & ComboBox2.valuemember & "')"
                    Dim cmd As New OleDbCommand(st, con)
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            Dim cmd As New OleDbCommand("select * from familia where nome = '" & ComboBox4.Text & "'", con)
            Dim drdr As OleDbDataReader
            drdr = cmd.ExecuteReader
            TextBox1.Text = drdr.Item("idfamilia1")
            TextBox5.Text = drdr.Item("nome")
            ComboBox2.Text = drdr.Item("idfamilia2")

            Dim cmd2 As New OleDbCommand("select * from familia2 where idfamilia2= '" & ComboBox2.Text & "'", con)
            Dim drdr2 As OleDbDataReader
            drdr2 = cmd2.ExecuteReader
            TextBox7.Text = drdr.Item("nome2")


eu aqui ao tentar listar o campo relacionado vindo da minha tabela 2 da me um erro

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