Assembly: System.Data (in system.data.dll)
You must explicitly call the Close method when you are finished using the OdbcDataReader to use the associated OdbcConnection for any other purpose.
Do not call Close or Dispose on a Connection, a DataReader, or any other managed object in the Finalize method of your class. In a finalizer, you should only release unmanaged resources that your class owns directly. If your class does not own any unmanaged resources, do not include a Finalize method in your class definition. For more information, see Garbage Collection.
The following example creates an OdbcConnection, an OdbcCommand, and an OdbcDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OdbcDataReader, and then the OdbcConnection.
Public Sub ReadData(ByVal connectionString As String) Dim queryString As String = _ "SELECT OrderID, CustomerID FROM Orders" Using connection As New OracleConnection(connectionString) Dim command As New OracleCommand(queryString, connection) connection.Open() Dim reader As OracleDataReader reader = command.ExecuteReader() ' Always call Read before accessing data. While reader.Read() Console.WriteLine(reader.GetInt32(0) & ", " & reader.GetString(1)) End While ' Always call Close when done reading. reader.Close() End Using End Sub
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.