OleDbDataReader Class
Provides a way of reading a forward-only stream of data rows from a data source. This class cannot be inherited.
Assembly: System.Data (in System.Data.dll)
To create an OleDbDataReader, you must call the ExecuteReader method of the OleDbCommand object, instead of directly using a constructor.
Before you close the OleDbConnection, first close the OleDbDataReader object. You must also close the OleDbDataReader object if you plan to resuse an OleDbCommand object.For example, you cannot retrieve output parameters until after you call Close.
Changes made to a result set by another process or thread while data is being read may be visible to the user of the OleDbDataReader. However, the precise behavior is timing dependent.
IsClosed and RecordsAffected are the only properties that you can call after the OleDbDataReader is closed. Although the RecordsAffected property may be accessed while the OleDbDataReader exists, always call Close before returning the value of RecordsAffected to guarantee an accurate return value.
The following example creates an OleDbConnection, an OleDbCommand, and an OleDbDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OleDbDataReader and then the OleDbConnection.
Public Sub ReadData(ByVal connectionString As String, _ ByVal queryString As String) Using connection As New OleDbConnection(connectionString) Dim command As New OleDbCommand(queryString, connection) connection.Open() Dim reader As OleDbDataReader = command.ExecuteReader() While reader.Read() Console.WriteLine(reader(0).ToString()) End While reader.Close() End Using End Sub
System.MarshalByRefObject
System.Data.Common.DbDataReader
System.Data.OleDb.OleDbDataReader
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.