Use BufferedStream : BufferedStream : File Directory Stream C# Examples

    
using  System;
using  System.IO;

public  class  MainClass
{
        public  static  int  Main(string[]  args)
        {

        FileStream  dumpFile  =  new  FileStream("Dump.dat",  FileMode.Create,  FileAccess.ReadWrite);
        BufferedStream  myFileBuffer  =  new  BufferedStream(dumpFile);
        
        byte[]  str  =  {127,  0x77,  0x4,  0x0,  0x0,  0x16};
        myFileBuffer.Write(str,  0,  str.Length);

        //  add  changes  to  file.
        myFileBuffer.Close();    //  Flushes.
        dumpFile.Close();    //  Flushes.

        return  0;
        }
}