/*==================================NextBytes===================================
      **Action:  Fills the byte array with random bytes [0..0x7f].  The entire array is filled.
      **Returns:Void
      **Arugments:  buffer -- the array to be filled.
      **Exceptions: None
      ==============================================================================*/
      public virtual void NextBytes(byte [] buffer){
        if (buffer==null) throw new ArgumentNullException("buffer");
        Contract.EndContractBlock();
        for (int i=0; i<buffer.Length; i++) {
          buffer[i]=(byte)(InternalSample()%(Byte.MaxValue+1)); 
        }
      }