using System;

public class Program

{

    public static void Main()

    {

        byte[] bytearray = new byte[] {97,114,114,97,121,32,101,120,97,109,112,108,101,115 };

        //method1

        string txt = System.Text.ASCIIEncoding.ASCII.GetString(bytearray);

​

        //method2

        string text2 = System.Text.Encoding.Default.GetString(bytearray);

        Console.WriteLine(txt);

        Console.WriteLine(text2);

    }

}