File copier FileStream

Proposed exercise

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Create a program to copy a source file into a destination file. You must use FileStream and a block size of 512 Kb. An example of use might be:

mycopy file.txt e:\file2.txt

It must behave correctly if the source file does not exist and it must warn (but not overwrite it) if the destination file exists.

Solution

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using System;
using System.IO;

public class FileCopier
{
   public static void Main()
   {
      const int BUFFER_SIZE = 512 * 1024;

      byte[] data = new byte[BUFFER_SIZE];

      FileStream fileR = File.OpenRead("data.exe");
      FileStream fileW = File.Create("data.copy.exe");

      int amountRead;

      do
      {
         amountRead = fileR.Read( data,0,BUFFER_SIZE );
         fileW.Write( data,0,amountRead );
      }
      while (amountRead == BUFFER_SIZE);

      fileR.Close();
      fileW.Close();
   }

}