vs连接oracle数据库怎么连接不上，到底是哪里出问题了

using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OracleClient;
namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
           
        
            OracleConnection conn = new OracleConnection();
           conn.ConnectionString = "data source=database;user id=scott;password=472312";
            conn.Open();
            MessageBox.Show("open");
        
        }
    }
}