Not able to import Oracle.DataAccess.Client using Oracle 11g database in Window7 platform

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VB

Hi,
I need help here. I've installed Oracle 11g database in Windows 7 platform.
Tested the odbc connection from Windows\SysWOW64\odbcad32.exe is working fine.
But i encounter error when import the DataAccess Client in Visual Studio 2005 ~ VB.Net. There is no problem in adding the reference Oracle.DataAccess.dll from Oracle\ora11r2\ODP.Net\bin\2.x\Oracle.DataAccess.dll but I encounter error in below code:

Imports Oracle.DataAccess.Client (Namespace or type specified in the Imports 'Oracle.DataAccess.Client' doesn't contain any public member or cannot be found. 

Dim myConnection As New OracleConnection(sConnStr) (Type 'OracleConnection' is not defined)

Is there anything I need to tweet so that I can import the oracle data access client to my code? Pls advise & TQ!