our team is delphi developer and the database they use is oracle,but iam new in oracle, and the the database they serve to me not only 1 database ,5 databases,and in delphi at runtime can acces the databases at once,bu in VS.net in c# ,one connection string is for one database,because oracle can join more than one table with two or more databases at run time,how do i connect to the oracle database in C#.NET,so that i can comunicate with oracle in 5 database in C#.net at runtime,because if using conectionstring only use one database ?,i usually user SQLServer for database.i have heard that in C# there is cyberconnection,please tell me,how to resolve the problem and what does it mean cyberconnection,how to use it

It is better to create DB LINK to connect one database with another .

Using that link you can execute you sql on other databases.

Regards
Debasis