public void WriteMessage(ref WritableBuffer buffer)
 {
     buffer.WriteBigEndian(Bid1);
     buffer.WriteBigEndian(Bid2);
     buffer.WriteBigEndian(Bid3);
     buffer.WriteBigEndian(Bid4);
     buffer.WriteBigEndian(Ask1);
     buffer.WriteBigEndian(Ask2);
     buffer.WriteBigEndian(Ask3);
     buffer.WriteBigEndian(Ask4);
     buffer.WriteBigEndian(Size1);
     buffer.WriteBigEndian(Size2);
     buffer.WriteBigEndian(Size3);
     buffer.WriteBigEndian(Size4);
     buffer.WriteAsciiString(SecurityCode);
     buffer.WriteLittleEndian(0x00);
 }