I am beginner in Oracle database system. As I noticed, it is possible to access and manipulate an Oracle database using .NET classes. ADO.NET (ActiveX Data Objects) is used to deal with MS SQL database and it exists by default (as I guess) in the Microsoft .NET Framework Class Library.
I would like to know if Oracle database .NET classes are also included by default in ADO.NET or do I need to install/configure it to start using it?
There is System.Data.Oracle in the BCL but it was deprecated in 2009 and should no longer be used because it might be removed in a future version of the framework. You should download and use the ODP.NET provider from Oracle.