1 word causes this >is not declared it may be inaccessible due to protection level vs2010

Imports System.Data.OleDb
Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        OleDbDataAdapter1.Fill(DataSet11)
    End Sub

    Private Sub LandlordID_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LandlordID.SelectedIndexChanged
        Dim ID, SQLString As String
        Dim dtProperties As New DataTable()
        Dim dbDataAdapter As OleDbDataAdapter
        Dim ConnectString As String = "Provider = Microsoft.Jet.OLEDB.4.0;" & "Data Source = Database.accdb"
        ID = LandlordID.Text
        SQLString = "Select * From Properties WHERE ID = " & "'" & ID & "'" & ""
        dbDataAdapter = New OleDbDataAdapter(SQLString, ConnectString)
        grdProperties.DataSource = dtProperties
    End Sub

    Private Sub postcodes_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles postcodes.SelectedIndexChanged
        Dim postcode, SQLString As String
        Dim dtProperties As New DataTable()
        Dim dbDataAdapter As OleDbDataAdapter
        Dim ConnectString As String = "Provider = Microsoft.Jet.OLEDB.4.0;" & "Data Source = Database.accdb"
        postcode = postcodes.Text
        SQLString = "Select * From Properties WHERE postcode = " & postcode & ""
        dbDataAdapter = New OleDbDataAdapter(SQLString, ConnectString)
        dbDataAdapter.Fill(dtProperties)
        grdProperties.DataSource = dtProperties
    End Sub
End Class