Add a buffering layer to FileStream : BufferedStream : File Directory Stream C# Examples

    
using  System;
using  System.Windows.Forms;
using  System.IO;

class  MainClass
{
    public  static  void  Main()  
    {
        FileStream  inStream  =  File.OpenRead("c:\\text.txt");
        FileStream  outStream  =  File.OpenWrite("c:\\text.txt"  +  ".bak");

        
        BufferedStream  bufInStream  =  new  BufferedStream(inStream);
        BufferedStream  bufOutStream  =  new  BufferedStream(outStream);

        byte[]  buf  =  new  byte[1024];
        int  bytesRead;

        while  ((bytesRead  =  bufInStream.Read(buf,  0,  1024))  >  0)
            bufOutStream.Write(buf,  0,  bytesRead);

        bufOutStream.Flush();
        bufOutStream.Close();
        bufInStream.Close();
        outStream.Close();
        inStream.Close();
    }
}