c#连接远程oracle数据库

 private static string connstr = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=Mhost) 
(PORT=mport)))(CONNECT_DATA=(SERVICE_NAME=mywervicename)));Persist Security Info=True;User Id=myusername; 
Password=mypassword";
 private OracleConnection DBCONN = new OracleConnection(connstr);

private static string connstr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
private OracleConnection DBCONN = new OracleConnection(connstr);

 public void GetData()
 {
 if (DBCONN.State == ConnectionState.Closed)
 {
 DBCONN.Open();
 string quarystr = "select * from tablename";
 OracleCommand comm = new OracleCommand(quarystr, DBCONN);
 OracleDataReader reader;
 reader = comm.ExecuteReader();
 while (reader.Read())
 {
 string str = "" + reader.GetString(1);
 }
 }
 }