ASP.NET DbDataReaderでデータ取得

'接続情報取得
Dim constr As ConnectionStringSettings = ConfigurationManager.ConnectionStrings("MyDB")
Dim myProvider As DbProviderFactory = DbProviderFactories. _
                                          GetFactory(constr.ProviderName)
Dim myConnection As DbConnection = myProvider.CreateConnection()

myConnection.Open()

'DbCommand生成
Dim myCommand As DbCommand = myProvider.CreateCommand()
'SQL設定
myCommand.CommandText = "SELECT * FROM [test]"
'データソースへ接続
myCommand.Connection = myConnection
'DbDataReader生成
Dim myReader As DbDataReader = myCommand.ExecuteReader()

'先頭レコードのみ取得してみる
While myReader.Read()
    TextBox1.Text = myReader.GetString(1)
    Exit While
End While

'Close処理
myReader.Close()
myConnection.Close()