在一个连接上多个OleDbDataReader：确定它正在这种情况下工作

我在一个OleDbConnection网上search了多个OleDbDataReader，但所有的答案是否定的，但是，这个代码工作没有错误。 这是为什么？

Dim DATA_BASE_Name As String = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) & "\TABLES.XLS" Dim ConnectionStringBuilder As New System.Data.OleDb.OleDbConnectionStringBuilder ConnectionStringBuilder("Provider") = "Microsoft.Jet.OLEDB.4.0" ConnectionStringBuilder("Data Source") = DATA_BASE_Name ConnectionStringBuilder("Mode") = "ReadWrite" ConnectionStringBuilder("Extended Properties") = "Excel 8.0;HDR=No" Dim XLS_DATA_BASE As OleDbConnection = New OleDbConnection(ConnectionStringBuilder.ConnectionString) XLS_DATA_BASE.Open() Dim Command As OleDbCommand = New OleDbCommand Dim Command2 As OleDbCommand = New OleDbCommand Command.Connection = XLS_DATA_BASE Command2.Connection = XLS_DATA_BASE Command.CommandText = "SELECT * FROM [Sheet1$A1:A100]" Command2.CommandText = "SELECT * FROM [Sheet1$B2:E10]" Dim dbReader1 As OleDbDataReader = Command.ExecuteReader() Dim dbReader2 As OleDbDataReader = Command2.ExecuteReader() For row As Short = 1 To 2 dbReader1.Read() Dim a1 As String = dbReader1.GetValue(0).ToString dbReader2.Read() Dim a2 As String = dbReader2.GetValue(0).ToString Next dbReader1.Close() dbReader2.Close()