How to connect to Oracle?

Hello Everyone,
I am new to Oracle - but I have done some work with SQL Server.
So I started an application in C# and I want to open a connection to the Oracle Database ( I downloaded the Express Edition of 10g)
However when I go to the top of my file and I want to say
using System.Data.OracleClient only System.Data.SQLClient comes on by default.
Do I need to import any additional references to my project in order to be able to see the namespace?
I am using VS 2005 Academis Edditon.
Thanks in Advance.
Susan

Hi There,
I wrote an app for a customer in .NET 2005( VC#) and using microsoft's data provider for oracle. I have oracleXE 10g on my laptop to test my app. there's no problem when testing on my laptop. but after I installed the app to the customer's client pc, I couldn't reach the server on another main pc. the server is oracle 8 installed on IRIX(unix based) OS and the client is the same version on the client PC.
my connection string in the program is like "data source=the IP of the server PC;user id=***;password=*** "
I think I miss something small.
I'll be very pleased if you help me urgently.
thanks

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