คำสั่ง OracleConnection และอื่นๆ ใช้ไม่ได้ครับ แสดงข้อความ obosolete

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OracleClient;

namespace TOU_Transference
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        OracleConnection objConn;
        OracleCommand objCmd;

        private void Form1_Load(object sender, EventArgs e)
        {
            String strConnString;
            strConnString = "Data Source=XE;Persist Security Info=True;User ID=xxxx;Password=xxxx;Unicode=True;";
            objConn = new OracleConnection(strConnString);
            objConn.Open();

            if (objConn.State == ConnectionState.Open)
            {
                this.lbText.Text = "Oracle Connected";
            }
            else
            {
                this.lbText.Text = "Oracle Connect Failed";
            }
        }
    }
}