File Directory Stream C# Tutorial

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  4. Use FileStream to write a file by byte array
using System;
using System.Windows.Forms;
using System.IO;
class MainClass
{
  public static void Main() 
  {
    FileStream inStream = File.OpenRead("C:\\test.txt");
    FileStream outStream = File.OpenWrite("C:\\test.txt" + ".bak");
    byte[] buf = new byte[4096];
    int bytesRead;
    while ((bytesRead = inStream.Read(buf, 0, 4096)) > 0)
      outStream.Write(buf, 0, bytesRead);
    outStream.Flush();
    outStream.Close();
    inStream.Close();
  }
}