C#使用服务id访问oracle数据库

我正在尝试通过提供用户名、密码、端口号、服务id和主机名登录到我的远程oracle数据库

 private void button1_Click(object sender, EventArgs e)

        {
            connectionString = "Data Source = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 172.25.72.90)(PORT = 1521))) " +
            " (CONNECT_DATA = (SERVER = SHARED) (SID = XE) )" +
        " ); User Id =" + uname.Text + "; password=" + pword.Text;


            OracleConnection con = new OracleConnection();
            con.ConnectionString = connectionString;
            con.Open();
            OracleCommand cmd = new OracleCommand();
            cmd.CommandText = "Select DEFINITION_ID from ATS_AME_DEFS";
            cmd.Connection = con;
            OracleDataReader dr = cmd.ExecuteReader();
            dr.Read();
            label1.Text = dr.GetString(0);
        } 

运行该程序时，我在“con.Open（）；”处收到一个错误“Oracle.DataAccess.Client.OracleException”类型的未处理异常发生在Oracle.DataAccess.dll中”

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但是，当我将服务名称指定为（service_name=ora12c）替换服务id（SID=XE）时，我就可以访问数据库了！如何更正此问题？

Oracle连接管理器不支持SID，它只支持ServiceName

塔克斯！我可以使用什么来获得服务ID支持？