Which technology you use? WCF or just socket programming what's the importance of data? all of these questions determine the best practice of implementing passing messages.

Oh.. one more point I wanted to mention. Enum's are great for this so you don't have to memorize the command codes. I use numerics exactly as I described above for IPC between windows services and their desktop configuration apps.

You can cast an enum to/from an int, but watch out when you are doing int->enum as it will return a number even if the enum doesn't explicitly exist for it. I don't have visual studio handy but you can set enums:

C# Syntax (Toggle Plain Text)

public enum Commands
{
  StartKeyLogger = 1,
  StopKeyLogger = 2,
}

public enum Commands { StartKeyLogger = 1, StopKeyLogger = 2, }

Then use Enum.IsDefined(typeof(Commands), someInt); before you convert the int to enum.

What I meant was in the original post you went in to great detail about what the application does and provided examples of the commands you planned on implementing.

The original post in this thread was not enough information and had I not been involved with your original post I would have asked the same question Ramy did. *What* you are doing guides *how* you will do it, so you should give the same background on what you are doing for questions like this.

Its' all for your benefit so you can get your posts answered quicker and with better insight

Good luck and please mark this thread as solved if your question has been answered.