ADO Net C# Tutorial

using System;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
class MainClass
{
  static void Main(string[] args)
    {
        string ConnectionString ="server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;";
        string SQL = "SELECT * FROM Employee";
        SqlConnection conn = new SqlConnection(ConnectionString);
        SqlCommand cmd = new SqlCommand(SQL, conn);
        
        conn.Open();
        SqlDataReader reader = cmd.ExecuteReader();
        Console.WriteLine("ID, FirstName");
        while (reader.Read())
        {
            Console.Write(reader["ID"].ToString() + ", ");
            Console.Write(reader["FirstName"].ToString() + ", ");
        }
    Console.WriteLine("Total Number of records affected: "+ reader.RecordsAffected.ToString() );
        reader.Close();
        conn.Close();
    }
}