winform连接Oracle数据库

winform怎么连接Oracle数据库，

            //连接数据库
            string connString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.xxx.xxx)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ASRS)));Persist Security Info=True;User ID=asrs_bd_bf_1;Password=asrs;";

            OracleConnection conn = new OracleConnection(connString);
            conn.Open();

我这样写的连接数据库的方法，为啥到open的时候就显示应用程序处于中断模式

using System;
using System.Data;
using Oracle.ManagedDataAccess.Client;

namespace ODP.NET
{
    class Program
    {
        static void Main(string[] args)
        {
            OracleConnection conn = null;
            try
            {
                conn = OpenConn();
                var cmd = conn.CreateCommand();
                cmd.CommandText = "select * from s_awb_master where rownum=1";
                cmd.CommandType = CommandType.Text;
                var reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    Console.WriteLine(string.Format("AwbPre:{0},AwbNo:{1}", reader["AwbPre"], reader["AwbNo"]));
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                CloseConn(conn);
            }
            Console.Read();
        }


        static OracleConnection OpenConn()
        {
            OracleConnection conn = new OracleConnection();
            conn.ConnectionString = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=***.***.***.***)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=***)));Persist Security Info=True;User ID=***;Password=***;";
            conn.Open();
            return conn;
        }

        static void CloseConn(OracleConnection conn)
        {
            if (conn == null) { return; }
            try
            {
                if (conn.State != ConnectionState.Closed)
                {
                    conn.Close();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                conn.Dispose();
            }
        }
    }
}