private static string GetConnectionString()
    {
        String connString = "host= serverName;database=myDatabase;uid=userName;pwd=passWord";
        return connString;
    }

 private static void ConnectingToOracle()
    {
        string connectionString = GetConnectionString();
        using (OracleConnection connection = new OracleConnection())
        {
            connection.ConnectionString = connectionString;
            connection.Open();
            Console.WriteLine("State: {0}", connection.State);
            Console.WriteLine("ConnectionString: {0}",
                              connection.ConnectionString);

            OracleCommand command = connection.CreateCommand();
            string sql = "SELECT * FROM myTableName";
            command.CommandText = sql;

            OracleDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                string myField = (string)reader["MYFIELD"];
                Console.WriteLine(myField);
            }
        }
    }

using System;
using Oracle.DataAccess.Client;
class OraTest
{
OracleConnection con;
void Connect()
{
con = new OracleConnection();
con.ConnectionString = "User Id=<username>;Password=<password>;Data Source=<datasource>";
con.Open();
Console.WriteLine("Connected to Oracle" + con.ServerVersion);
}
void Close()
{
con.Close();
con.Dispose();
}
static void Main()
{
Example OraTest= new OraTest();
OraTest.Connect();
OraTest.Close();
}
}