C# FileStream ReadAsync(Byte[], Int32, Int32)

[ComVisibleAttribute(false)]/*from ww  w.  j  a v  a 2  s.  c  o m*/
[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public Task<int> ReadAsync(
  byte[] buffer,
  int offset,
  int count
)

/*from   w w w  .  j  a v  a2  s.  c  o  m*/
using System;
using System.Text;
using System.Threading.Tasks;
using System.IO;

public class MainWindow
{
    public static void Main(){}
    public MainWindow()
    {
        UnicodeEncoding uniencoding = new UnicodeEncoding();
        string filename = @"c:\Users\exampleuser\Documents\userinputlog.txt";
        byte[] result;

        using (FileStream SourceStream = File.Open(filename, FileMode.Open))
        {
            result = new byte[SourceStream.Length];
            await SourceStream.ReadAsync(result, 0, (int)SourceStream.Length);
        }
        Console.WriteLine(uniencoding.GetString(result));
    }
}