StreamReader and StreamWriter

using System;
using System.IO;
using System.Linq;
class Program
{
    static void Main()
    {
        using (FileStream fs = File.Create("test.txt"))
        using (TextWriter writer = new StreamWriter(fs))
        {
            writer.WriteLine("Line1");
            writer.WriteLine("Line2");
        }

        using (FileStream fs = File.OpenRead("test.txt"))
        using (TextReader reader = new StreamReader(fs))
        {
            Console.WriteLine(reader.ReadLine()); // Line1
            Console.WriteLine(reader.ReadLine()); // Line2
        }
    }
}