C# Client (String array, Bytes, Internal Error, Arguement Error)

Yeah I understand, I have a program that runs it through a COM port, I am pretty much trying to make it through the internet having the program now work as a stand alone server and have the C# program connect to it and perform everything. Tougher than I expected but getting close. Do you have any advice you can give for that.

For example, I have one as a SerialPort1.Write and SerialPort1.Read, would I be able to say, turn all those points to whenever I do a SerialPort1.Write to a Client.GetStream() but have the data converted before that? Not refactored at the moment though.

Also, I don't want to send a string. I want to send an array of bytes. How would I send an array of bytes after converting it?