file Info and File Stream, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.Data;
using System.Security;
using System.Security.Permissions;
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            
            String fileName = @"F:\NPkey.txt";
            FileInfo fi = new FileInfo(fileName);
            
            try
            {
                using (FileStream stream = fi.Create())
                    
                {
                 Byte[] txt = new UTF8Encoding(true).GetBytes("New File.");
                 stream.Write(txt , 0, txt.Length);
                 Byte[] Author = new UTF8Encoding(true).GetBytes("William Shakespeare");
                 stream.Write(Author, 0,Author.Length);
                    
                }
                
                using (StreamReader rdr = new StreamReader(fileName))
                {
                 
                    string s = "";
                    while((s = rdr.ReadLine())!= null)
                    {
                        Console.Write(s);
                    }
                    
                }
                
            }
            
            catch(Exception ex)
            {
             Console.Write(ex.ToString());
             
            }
        }
    }
}

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Compilation time: 0,2 sec, absolute running time: 0,16 sec, cpu time: 0,14 sec, average memory usage: 13 Mb, average nr of threads: 3, absolute service time: 0,38 sec