SQlClient

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string connString = @"Data Source=S013;Initial Catalog=Northwind;Integrated Security=True";
            string sql = @"select * from employees";
            SqlConnection conn = null;
            SqlDataReader reader=null;
            try
            {
                conn = new SqlConnection(connString);
                conn.Open();
                SqlCommand cmd = new SqlCommand(sql,conn);
                reader = cmd.ExecuteReader();
                Console.WriteLine("This program demonstrrates the use of the SQL Server Data Provider.");
                Console.WriteLine("Querying database {0} with query {1}\n",conn.Database,cmd.CommandText);
                Console.WriteLine("First name\tLastName\n");
                while (reader.Read())
                {
                    Console.WriteLine("{0}|{1}",reader["firstname"].ToString().PadLeft(10),reader[1].ToString().PadLeft(10));
                }
            }
            catch (SqlException ex)
            {
                Console.WriteLine("Error:"+ex);
            }
            finally
            {
                reader.Close();
                conn.Close();
            }
        }
    }
}