header files

So I'm basically making a mini version of IRC, with one server that handles connections from a lot of clients.  Then I decided I would pretty much make my own protocol, with a header attached to every operation.  Every operation, sending text, sending a file, creating/joining a room, would have a header attached to it with details like receiver and sender IDs, time stamp, etc. 

So this sounds nice and all in theory, but I'm absolutely at a loss at how to code this thing.  How would I join the header object to the data object?  concat?  Except I don't know wtf that is.  After a client receives something, how would it separate the header from the data?

And making the header... if I create a new header, decide that its sub-operation is going to be "sending," how do I send it to the file class, have the file class create the sub-op packet, and return it?  It all makes sense conceptually but writing the code is hitting me like a brick wall.

I would answer this question to get this shit off the first page, but I can't even make out what the fuck the TC is trying to say.  Are you asking how to combine a header and source file in [b]C#[/b]?

If you just want a header on each thing sent, just write your own definition of what every message needs to contain and which bytes contain what.