create a program that communicate with the arduino using VB.net - vb.net

Question

I have to create a program that send comand to the arduino;
The program must be the client and the arduino the server.
So the question is: what is the code to start the communication?
P.S. the arduino obviously have an ethernet shield on it.

Answer 1

I have searched on google, i found this :
For Arduino :
https://www.arduino.cc/en/Reference/Ethernet
For Windows :
http://www.nullskull.com/articles/20020323.asp

Answer 2

I've not used Arduino myself but a have a look at Arduino Playground:
CmdMessenger is a messaging library for the Arduino Platform (and .NET/Mono platform). It uses the serial port as transport layer. To use CmdMessenger, we define a list of command identifiers, then attach callback / handler functions for received messages.
The message format is: Cmd Id, param 1, [...] , param N;
The library gives the following functionality:
Sending and receiving commands
Calling of associated functions on received commands
Sending and receiving zero to many arguments per command
Sending and receiving of all primary types. This includes bytes, longs, ints, floats and doubles.
Sending and receiving in plain text form (human readable, robust) or in binary form (efficient)
The library can be downloaded through the Arduino or PlatformIO library manager, or downloaded as a stand-alone package, see the read-me page.