_ClientSocket.Send(ASCIIEncoding.ASCII.GetBytes("REGISTER_ME");
_ClientSocket.Send(ASCIIEncoding.ASCII.GetBytes(System.Environment.MachineName));

Socket thisSocket = (Socket)AsyncResult.AsyncState;
int Received = thisSocket.EndReceive(AsyncResult);
byte[] DataBuffer = new byte[Received];
Array.Copy(_Buffer, DataBuffer, Received);

MessageBox.Show(Encoding.ASCII.GetString(DataBuffer));
if(Encoding.ASCII.GetString(DataBuffer) == "REGISTER_ME")
{
     //Here's the problem, I need to find a way to fetch *System.Environment.MachineName* when the command *REGISTER_ME* is requested from the client
}