ADO Net C# Tutorial

using System;
using System.Data;
using System.Data.SqlClient;
    class PopDataTable
    {
        static void Main(string[] args)
        {
            string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
            string sql = @"select productname,unitprice from products where unitprice < 20";
            SqlConnection conn = new SqlConnection(connString);
            try{
                conn.Open();
                SqlDataAdapter da = new SqlDataAdapter(sql, conn);
                DataTable dt = new DataTable();
                da.Fill(dt);
                foreach (DataRow row in dt.Rows)
                {
                    foreach (DataColumn col in dt.Columns)
                        Console.WriteLine(row[col]);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: " + e);
            }
            finally
            {
                conn.Close();
            }
        }
    }