using System;

using System.IO;

using System.Text;

public class Program

{

    public static void Main()

    {

        using(var ms = new MemoryStream())

        using(var writer = new StreamWriter(ms)){

            writer.Write("asdf");

            Encoding encoding = Encoding.UTF8;

            Console.WriteLine(encoding.GetString(ms.ToArray()));

        }

    }

}