มีปัญหาเรื่องการเปิดไฟล์ .sdf บน Mobile ครับ วานผู้รู้ช่วยตอบทีคับ

 Private Sub btnLoad_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLoad.Click
        Dim cn As SqlCeConnection
        'string path = Assembly.GetExecutingAssembly().GetName().CodeBase
        'string file = Path.Comblie(Path.GetDirectoryName(path),"//AppDatabase1.sdf)
        'cn = New SqlCeConnection("Data Source =" _
        '    + (System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly.GetName.CodeBase) + "\AppDatabase1.sdf;"))
        cn = New SqlCeConnection("Data Source = D:\AppDatabase1.sdf")
        cn.Open()

        'cn.Open()
        Dim myCommand As SqlCeCommand = cn.CreateCommand()
        dt = Nothing
        myCommand.CommandText = "SELECT [id], [name], [email] ,'A' as [flag] FROM [mytable] " 'WHERE id = '" & strID & "' "
        myCommand.CommandType = CommandType.Text
        dt = New DataTable
        Adapter = New SqlCeDataAdapter(myCommand)
        Adapter.Fill(dt)
        GridView.DataSource = dt
    End Sub