vs2008中如何连接服务器上Oracle实例？

本地机器tnsnames.ora
ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = fuqiang)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )


SERVICEORCL=
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 服务器IP)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

服务器tnsnames.ora
SERVICEORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 服务器名称)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )
VS中连接代码：
C# code:
OracleConnection oracleConnection = new OracleConnection("Data Source=;User ID=system;Password=manager;Unicode=True");


这样写连接字符串，可以连接到本地orcl这个实例，没有问题。但是想连接到服务器上的orcl实例，该如何写连接字符串，其它地方都一样吧，只是Data Source要怎么写？{{