ADO Net C# Tutorial

using System;
using System.Data;
using System.Data.SqlClient;
    class Program{
        static void Main(string[] args)
        {
            string sqlConnectString = "Data Source=(local);Integrated security=SSPI;Initial Catalog=AdventureWorks;";
            string sqlSelect = "SELECT ContactID, FirstName, LastName FROM Person.Contact";
            SqlDataAdapter da = new SqlDataAdapter(sqlSelect, sqlConnectString);
            DataTable dt = new DataTable( );
            da.Fill(dt);
            for (int i = 0; i < 5; i++)
            {
                DataRow row = dt.Rows[i];
                Console.WriteLine(i);
                Console.WriteLine(row[0]);
                Console.WriteLine(row["FirstName"]);
                Console.WriteLine(row[2, DataRowVersion.Default]);
            }
        }
    }