problem in connecting to oracle data in C# in windows 7

hello

this is the code i used to connect to the oracle database but it is not getting connected. Is there anything wrong in the code or i heard that in windows 7 the connection does not happen...can some one please help me

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Data.OracleClient;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication9

{

    public partial class Form1 : Form

    {

        

       // OracleCommand cmd;

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            OracleConnection con;

            string str = "Data Source=orcl;User Id=scott;Password=tiger;";

           con = new OracleConnection(str);

        

            con.Open();

            if (con.State == ConnectionState.Open)

            {

                MessageBox.Show("database connected");

            }

            else

            {

                MessageBox.Show("database not connected");

            }

        }